The physical-quantities Reference Manual

Table of Contents

The physical-quantities Reference Manual

This is the physical-quantities Reference Manual, version 0.1, generated automatically by Declt version 3.0 "Montgomery Scott" on Mon Apr 19 17:22:53 2021 GMT+0.

1 Introduction

Physical Quantities

This lisp library handles physical quantities which consist of

• Value/Magnitude
• Uncertainty/Error
• Unit

where the type of the value can be any subtype of real. For the uncertainty, both absolute and relative values are possible. Combinations of lisp symbols or strings are used to describe units. User defined units including abbreviations and prefixes are supported. Error propagation and unit checking is performed for all defined operations.

Example usage

The following example illustrates the use of the library:

(require :asdf)
(asdf:load-system :physical-quantities)
(use-package :physical-quantities}
(define-si-units)
(define-read-macros)

(let (m c e)
  ;; Define the mass
  (setf m #q(1.00 +/- 0.01 kg))
  ;; The speed of light
  (setf c #q(299792458 m / s))
  ;; e = m * c^2
  (setf e (q* m (qpow c 2)))
  ;; Print e, converted to petajoule
  (print #q(e -> PJ)))

This will print

#<QUANTITY 89.87552 +/- 1.0 % petajoule {...}>

Defining quantities

To define a quantity, either the macro (quantity ...) or the read macro #q(...) can be used. For the latter, the function (define-read-macros) must be called first.

The following lines of code are equivalent:

(quantity 1 "kilogram")
(quantity 1 "kg")

(define-read-macros)
#q(1 kilogram)
#q(1 kg)

This creates an object of type quantity. Its value is the integer 1 and its unit is kilogram. The uncertainty/error of this quantity is zero because it was not specified. To define it, the symbol +/- (or +-), followed by a number, can be inserted into the macro call after the value:

#q(1 +/- 0.2 kg)

This sets the absolute error to 0.2 kg. To define a relative error, the % sign has to be appended:

#q(1 +/- 20 % kg)

Note that there must be space between numbers and symbols.

It is permitted to use variables or even lisp forms instead of numbers for both the value/magnitude or the uncertainty/error.

Specifying units

Units are specified as a sequence of unit factors. A unit factor is essentially a unit and a power. The power defaults to 1 when only naming the unit (e.g. metre). If a power of -1 is desired, either the symbol / or per can be inserted before the unit (e.g / metre or per metre). Powers other than 1 or -1 are specified in any of the following ways:

metre ^ 2
metre ** 2
metre to the 2
/ metre ^ 2
/ metre ** 2
/ metre to the 2

Note that / metre is equivalent to metre ^ -1.

For the powers 2 and 3, there are special keywords:

square metre
cubic metre
metre squared
metre cubed
/ square metre
/ cubic metre
/ metre squared
/ metre cubed

As pointed out above, the full unit is a sequence of such unit factors:

kilogram metre ^ 2 / second ^ 2 / kelvin / mole
kg m ^ 2 / s ^ 2 / K / mol

Please note that separating symbols with spaces is compulsory.

Unit abbreviations

Units can be abbreviated. This means that kilometre is interpreted in the same way as km. Note that both the unit metre and the prefix kilo is abbreviated. Mixing abbreviation (e.g. kmetre or kilom) is not supported.

Standalone units

Units without value can be obtained by using one of these methods:

(mkunit "metre" / "second")
(mkunit "m" / "s")
#u(metre / second)
#u(m / s)

These will all create the same unit. Note that the representation of the result may change in the future.

Upper- and lowercase

Lisp by default converts all symbols that it reads to uppercase. This default setting is disabled and case is preserved for units within the #q(...) and #u(...) read macros, therefore #q(1 Pa) has different units from #q(1 pA). When using the (quantity ...) or (mkunit ...) macros, this is not possible and therefore you would have to specify (quantity 1 "Pa") or (quantity 1 "pA"). The macros (quantity ...) and (mkunit ...) do accept symbols, but these will be converted to uppercase by the reader (usually causing a unit lookup error) unless they are escaped by using the |...| syntax for example.

Note that the #q(...) read macro makes the usual case conversion for the value/magnitude and uncertainty/error. Therefore, it is possible to write

(let ((val 1.0) (err 0.1))
  #q(val +/- err m / s))

which will result in #<QUANTITY 1.0 +/- 0.1 metre / second {...}>. The symbols are converted to uppercase in the let form as well as in the #q(...) read macro.

Operations

Common Lisp does not easily allow the redefinition/overloading of standard operators such as + or *. For this reason, a number of operators are provided to work with both types real and quantity. These are prefixed with the letter q, e.g. q+ or q*. Example:

(q* a (q+ b (qsqrt c)))

The result of such an operation is always a quantity, even if all arguments passed to the function are of type real.

When using these operations, error propagation will be performed automatically. The error propagation is first-order only and correlations are not taken into account.

Defining new operations

Apart from the predefined operations, new options can be defined as normal functions or methods. See section Accessing value, error and unit for relevant information.

There is a convenience macro defqop that automatically converts arguments to values of type quantity if a real number is passed:

(defqop factorial (number!u)
  (unless (errorlessp number)
    (error "The error propagation of FACTORIAL is undefined."))
  ;; Insert more tests here ...
  (make-quantity :value (loop for n from 1 upto (value number) for result = 1 then (* result n) finally (return result))))

The list of arguments (here only number!u) is not a lambda list and things like &optional or &key are not allowed. Furthermore, all arguments are expected to be either of type real or quantity. The ending !u in number!u means that the argument number should automatically be checked for unitlessness. Otherwise an error will be signaled. The suffix must only appear in the argument list.

Converting units

Units can be converted by calling the (quantity ...) or #q(...) macro and specifying -> and a new unit:

(let ((v #q(20 m / s)))
  (setf v #q(v -> km / h))
  (print v))

This would print

#<QUANTITY 72 kilometre / hour {...}>

Instead of using a variable as the first form in the macro call, one could specify any other form such as

#q((q* 1/2 m (qpow v 2)) -> joule)

or even a quantity definition

#q(20 +/- 1 % m / s -> km / h)

Note that it is an error if the units are not convertible.

Limitations

The unit conversion only considers the conversion factor. This means that linear conversions with offset (not to speak of nonlinear conversions) may not work as expected. For example

#q(1 celsius -> kelvin)

will produce 1 kelvin. The offset of 273.15 is ignored. This is fine for conversion of temperature differences, but not for absolute temperatures.

Accessing value, error and unit

To retrieve value/magnitude, uncertainty/error and unit of an object of type quantity, one can use the functions

• (value <quantity>) to retrieve the value/magnitude
• (unit <quantity>) to retrieve the unit
• (absolute-error <quantity>) or (aerr <quantity>) to retrieve the absolute uncertainty/error
• (relative-error <quantity>) or (rerr <quantity> to retrieve the relative uncertainty/error

These are all places, so they are setfable. Note that setting the absolute uncertainty will affect the relative uncertainty and vice versa. Also note that it is an error accessing the relative error when the value/magnitude is zero.

Machine interface

The macros (quantity ...) and #q(...) are intended as convenience for humans. They are not very lispy. To create quantities in a manner that is suitable for machines, the function (make-quantity ...) is defined:

(make-quantity :value 1 :error 0.1 :error-type :absolute :unit '(("m" 1) ("s" -1)))

This is equivalent to #q(1 +/- 0.1 m / s). Note that the unit is a list of unit factors with each unit factor being a symbol or string that stands for a unit and an integer for the power. Being a function, the arguments are evaluated before the quantity is created. This allows the unit to be a variable. Units can be created with the (make-unit ...) function:

(make-unit '("m" 1) '("s" -1))

Units can be converted using the (convert-unit ...) function. It accepts either a unit object or a list of unit factors:

(convert-unit v (make-unit '("km" 1) '("h" -1)))
(convert-unit v '(("km" 1) ("h" -1)))

Defining new units

New units can be defined using the (define-unit ...) macro:

(define-unit "metre" :abbrev "m" :alias "meter")
(define-unit "watthour" :def (1 "watt" "hour") :abbrev "Wh")
(define-unit "mile" :def (1609344/1000 "metre") :abbrev "mi")
(define-unit "gravity" :def (981/100 "metre" / "second" ^ 2) :abbrev "g")

There are a number of keywords that may appear in the definition:

• :def Specifies the unit in terms of another unit. Complex dependencies can be given such as (0.3048 "metre" / "second" ^ 2). If this keyword is missing, the newly defined unit will be considered a base unit.
• :alias Allows multiple (non-abbreviated) names for a unit, given as a single symbol or a list of symbols. This is helpful if there are different spellings (e.g. metre, meter).
• :abbrev Abbreviations for the unit can be specified here, given as a single symbol or a list of symbols. Be careful about name conflicts (see above).
• :prefix-test A function of two arguments, the base and the power, which decides whether a unit prefix is admissible for use with this unit. For more details, see below.
• :overwrite A flag to suppress errors that occur when a naming conflict is detected.

For all defined units and abbreviations, more units with all permissible prefixes such as kilowatthour or kWh will automatically be defined. This may cause naming conflicts which will raise an error. It is possible to define which prefixes are admissible.

Specifying admissible prefixes

For some units, certain prefixes make no sense. For example: For the unit tonne, the prefix kilo is widely used (kilotonne). It makes little sense, however, to use millitonne. To specify, which prefixes are admissible, the keyword parameter :prefix-test can be used in the call to define-unit. It accepts a function of two arguments, the base and the power of a prefix. The function can then decide, whether such a prefix is admissible by returning T or NIL. Here is an example:

(define-unit "tonne" :def (1000 "kilogram") :prefix-test (lambda (base power) (and (= base 10) (>= power 3))))

This will only allow the units tonne, kilotonne, megatonne, etc.

To facilitate the prefix test specification, some functions are provided:

• (prefix-base base &optional mod) Will return a function that accepts only the given base and powers divisible by mod (defaulting to 1).
• (prefix-range base from to) Will return a function that accepts only the given base and powers in the range between from and to (inclusive). To leave the range open on either side, NIL can be supplied.
• (prefix-list base &rest powers) Will return a function that accepts only the given base and the given powers.

To combine such tests, the following composing functions are provided:

• (prefix-and &rest functions) This will acccept a prefix if all functions accept it.
• (prefix-or &rest functions) This will accept a prefix if a single function accepts it.

You can use the standard composing function complement where necessary.

The above example could be rewritten to read

(define-unit "tonne" :def (1000 "kilogram") :prefix-test (prefix-range 10 3 nil))

Defining prefixes

Prefixes can be defined by using the (define-unit-prefix ...) macro:

(define-unit-prefix "giga" 9 :abbrev "G")
(define-unit-prefix "gibi" 3 :abbrev "Gi" :base 1024)

The full name is specified first, followed by the power. Keyword parameters allow the definition of the base (defaults to 10) and abbreviation. In this example, giga is equivalent to 10^9 and gibi to 1024^3.

You must define prefixes before defining the units that use them.

Standard units and prefixes

When calling the function (define-si-units &optional clear-existing-units), the SI units will be automatically defined. More sets may be available in the future.

Local namespaces

Several unit and prefix definitions can be used in a program by locally defining them. This can be done with the (with-local-units ...) and (with-saved-units ...) macros. The former completely clears the outside units and prefixes until control leaves the form. The latter makes a copy of all the unit definitions such that they can be changed within the body of the form without affecting the outisde definitions.

Please note that the unit definitions use dynamic scope an not lexical scope. This means that the unit definitions are only local during the time spent within the macro call. It is therefore not possible to close over the unit definitions. While quantities with local unit can be returned from this macro call, the unit may be undefined after the time of the call or may have a different meaning.

Errors/Conditions

The errors/conditions signaled by the library are all subtypes of physical-quantities-error which itself is a subtype of standard-error. However, no event triggers the physical-quantities-error directly. Instead, the most specific error is signaled. Here is the complete hierarcy of conditions:

• quantity-definition-error

  • quantity-definition-syntax-error: There is a syntax error in one of the following forms: #q(...), (quantity ...), (make-quantity ...), #u(...), (make-unit ...) or (mkunit ...).
  • quantity-definition-semantic-error: There is a semantic error in one of the following forms: #q(...), (quantity ...), (make-quantity ...), #u(...), (make-unit ...) or (mkunit ...).

• invalid-unit-error

  • invalid-unit-operation-error: The mathematical operation can not be performed on the input quantity with the given unit.
  • invalid-unit-conversion-error: The units can not be converted into each other.
  • invalid-unit-reference-error: The unit is undefined or the prefix unit combination does not exist.

• operation-undefined-error: The mathematical operation is undefined for the given input parameters.

• error-propagation-error: The propagation of uncertainty can not be performed with the given parameters.

• unit-definition-error

  • unit-definition-syntax-error: A syntactic problem exists with a (define-unit ...) or (define-prefix ...) form.
  • unit-definition-semantic-error: There is a semantic error with a (define-unit ...) or (define-prefix ...) form.
  • unit-definition-conflict-error: The unit or prefix is already defined or a combination of prefix and unit conflicts with another unit.

License

Physical Quantities: Lisp Library

Copyright (C) 2017 Marco Rossini

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

2 Systems

The main system appears first, followed by any subsystem dependency.

2.1 physical-quantities

Author

Marco Rossini

License

GPLv2

Description

A library that provides a numeric type with optional unit and/or uncertainty for computations with automatic error propagation.

Version

0.1

Dependency

parseq

Source

physical-quantities.asd (file)

Components

• package.lisp (file)
• utils.lisp (file)
• conditions.lisp (file)
• unit-factor.lisp (file)
• unit-database.lisp (file)
• units.lisp (file)
• quantity.lisp (file)
• numeric.lisp (file)
• parse-rules.lisp (file)
• read-macro.lisp (file)
• si-units.lisp (file)

3 Files

Files are sorted by type and then listed depth-first from the systems components trees.

3.1 Lisp

3.1.1 physical-quantities.asd

Location

physical-quantities.asd

Systems

physical-quantities (system)

3.1.2 physical-quantities/package.lisp

Parent

physical-quantities (system)

Location

package.lisp

Packages

physical-quantities

3.1.3 physical-quantities/utils.lisp

Dependency

package.lisp (file)

Parent

physical-quantities (system)

Location

utils.lisp

Internal Definitions

• beta (function)
• chebyshev-polynomial (function)
• chebyshev-polynomial% (function)
• confidence-interval (function)
• copy-hash-table (function)
• erf (function)
• has-key (function)
• have (function)
• inverf (function)
• l= (function)
• l> (function)
• ll= (function)
• mklist (function)
• mkstr (function)
• nand (macro)
• p-value (function)
• py+ (function)
• quantile (function)
• r-function-a (function)
• r-function-b (function)
• split (function)
• symb (function)
• unzip (function)
• with-gensyms (macro)
• xnor (function)

3.1.4 physical-quantities/conditions.lisp

Dependency

utils.lisp (file)

Parent

physical-quantities (system)

Location

conditions.lisp

Exported Definitions

• error-propagation-error (condition)
• invalid-unit-conversion-error (condition)
• invalid-unit-error (condition)
• invalid-unit-operation-error (condition)
• invalid-unit-reference-error (condition)
• operation-undefined-error (condition)
• physical-quantities-error (condition)
• unit-definition-conflict-error (condition)
• unit-definition-error (condition)
• unit-definition-semantic-error (condition)
• unit-definition-syntax-error (condition)

Internal Definitions

• f-error (macro)
• quantity-definition-error (condition)
• quantity-definition-semantic-error (condition)
• quantity-definition-syntax-error (condition)

3.1.5 physical-quantities/unit-factor.lisp

Dependency

conditions.lisp (file)

Parent

physical-quantities (system)

Location

unit-factor.lisp

Exported Definitions

• uf-power (function)
• (setf uf-power) (function)
• uf-unit (function)
• (setf uf-unit) (function)

Internal Definitions

• copy-unit-factor (function)
• make-uf (function)
• uf-equal (function)
• uf-pow (function)
• unit-factor (structure)
• unit-factor-p (function)

3.1.6 physical-quantities/unit-database.lisp

Dependency

unit-factor.lisp (file)

Parent

physical-quantities (system)

Location

unit-database.lisp

Exported Definitions

• define-unit (macro)
• define-unit-prefix (macro)
• with-local-units (macro)
• with-saved-units (macro)

Internal Definitions

• *unit-abbreviation-table* (special variable)
• *unit-alias-table* (special variable)
• *unit-prefix-table* (special variable)
• *unit-translation-table* (special variable)
• clear-units (function)
• define-unit% (function)
• define-unit-prefix% (function)
• lookup-unit (function)
• prefix-and (function)
• prefix-base (function)
• prefix-list (function)
• prefix-or (function)
• prefix-range (function)
• symbol-prefix (function)
• table-check (function)
• table-insert (function)
• unit-hash-key-check (function)
• with-unit-lookup (macro)

3.1.7 physical-quantities/units.lisp

Dependency

unit-database.lisp (file)

Parent

physical-quantities (system)

Location

units.lisp

Exported Definitions

• make-unit (function)
• mkunit (macro)
• str-unit (function)
• unitp (function)
• units-convertible (function)
• units-equal (function)
• units-equalp (function)

Internal Definitions

• collect-factors (function)
• convert-unit% (function)
• copy-unit (function)
• dereference-unit (function)
• divide-units (function)
• expand-unit (function)
• expand-unit-factor (function)
• multiply-units (function)
• power-unit (function)
• reduce-unit (function)
• root-unit (function)
• sort-unit (function)
• unit-has-unit-p (function)

3.1.8 physical-quantities/quantity.lisp

Dependency

units.lisp (file)

Parent

physical-quantities (system)

Location

quantity.lisp

Exported Definitions

• absolute-error (generic function)
• absolute-error (method)
• (setf absolute-error) (method)
• (setf absolute-error) (generic function)
• aerr (generic function)
• aerr (method)
• (setf aerr) (method)
• (setf aerr) (generic function)
• convert-to-base-units (function)
• convert-unit (function)
• make-quantity (function)
• quantity (macro)
• quantity (class)
• quantityp (function)
• relative-error (generic function)
• relative-error (method)
• (setf relative-error) (method)
• (setf relative-error) (generic function)
• rerr (generic function)
• rerr (method)
• (setf rerr) (method)
• (setf rerr) (generic function)
• unit (method)
• (setf unit) (method)
• value (method)
• (setf value) (method)

Internal Definitions

• ae (function)
• error-direct (method)
• (setf error-direct) (method)
• errorlessp (function)
• eval-quantity (generic function)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• has-error-p (function)
• has-unit-p (function)
• make-quantity% (function)
• re (function)
• unitlessp (function)

3.1.9 physical-quantities/numeric.lisp

Dependency

quantity.lisp (file)

Parent

physical-quantities (system)

Location

numeric.lisp

Exported Definitions

• defqop (macro)
• q* (function)
• q+ (function)
• q- (function)
• q/ (function)
• q/= (function)
• q< (generic function)
• q< (method)
• q< (method)
• q< (method)
• q< (method)
• q<= (generic function)
• q<= (method)
• q<= (method)
• q<= (method)
• q<= (method)
• q= (generic function)
• q= (method)
• q= (method)
• q= (method)
• q= (method)
• q> (generic function)
• q> (method)
• q> (method)
• q> (method)
• q> (method)
• q>= (generic function)
• q>= (method)
• q>= (method)
• q>= (method)
• q>= (method)
• qabs (function)
• qacos (function)
• qacosh (function)
• qasin (function)
• qasinh (function)
• qatan (function)
• qatanh (function)
• qcos (function)
• qcosh (function)
• qequal (function)
• qequalp (function)
• qexp (function)
• qexpt (function)
• qln (function)
• qlog (function)
• qop (macro)
• qpow (function)
• qroot (function)
• qround (function)
• qsin (function)
• qsinh (function)
• qsqrt (function)
• qtan (function)
• qtanh (function)

Internal Definitions

• dup-quantity (macro)
• error-propagation (macro)
• q-op-insert (function)
• round-to (function)

3.1.10 physical-quantities/parse-rules.lisp

Dependency

numeric.lisp (file)

Parent

physical-quantities (system)

Location

parse-rules.lisp

3.1.11 physical-quantities/read-macro.lisp

Dependency

parse-rules.lisp (file)

Parent

physical-quantities (system)

Location

read-macro.lisp

Exported Definitions

define-read-macros (function)

Internal Definitions

• read-quantity (function)
• read-unit (function)

3.1.12 physical-quantities/si-units.lisp

Dependency

read-macro.lisp (file)

Parent

physical-quantities (system)

Location

si-units.lisp

Exported Definitions

define-si-units (function)

4 Packages

Packages are listed by definition order.

4.1 physical-quantities

Source

package.lisp (file)

Nicknames

• pq
• pquant
• physq

Use List

• parseq
• common-lisp

Exported Definitions

• absolute-error (generic function)
• absolute-error (method)
• (setf absolute-error) (method)
• (setf absolute-error) (generic function)
• aerr (generic function)
• aerr (method)
• (setf aerr) (method)
• (setf aerr) (generic function)
• convert-to-base-units (function)
• convert-unit (function)
• define-read-macros (function)
• define-si-units (function)
• define-unit (macro)
• define-unit-prefix (macro)
• defqop (macro)
• error-propagation-error (condition)
• invalid-unit-conversion-error (condition)
• invalid-unit-error (condition)
• invalid-unit-operation-error (condition)
• invalid-unit-reference-error (condition)
• make-quantity (function)
• make-unit (function)
• mkunit (macro)
• operation-undefined-error (condition)
• physical-quantities-error (condition)
• q* (function)
• q+ (function)
• q- (function)
• q/ (function)
• q/= (function)
• q< (generic function)
• q< (method)
• q< (method)
• q< (method)
• q< (method)
• q<= (generic function)
• q<= (method)
• q<= (method)
• q<= (method)
• q<= (method)
• q= (generic function)
• q= (method)
• q= (method)
• q= (method)
• q= (method)
• q> (generic function)
• q> (method)
• q> (method)
• q> (method)
• q> (method)
• q>= (generic function)
• q>= (method)
• q>= (method)
• q>= (method)
• q>= (method)
• qabs (function)
• qacos (function)
• qacosh (function)
• qasin (function)
• qasinh (function)
• qatan (function)
• qatanh (function)
• qcos (function)
• qcosh (function)
• qequal (function)
• qequalp (function)
• qexp (function)
• qexpt (function)
• qln (function)
• qlog (function)
• qop (macro)
• qpow (function)
• qroot (function)
• qround (function)
• qsin (function)
• qsinh (function)
• qsqrt (function)
• qtan (function)
• qtanh (function)
• quantity (macro)
• quantity (class)
• quantityp (function)
• relative-error (generic function)
• relative-error (method)
• (setf relative-error) (method)
• (setf relative-error) (generic function)
• rerr (generic function)
• rerr (method)
• (setf rerr) (method)
• (setf rerr) (generic function)
• str-unit (function)
• uf-power (function)
• (setf uf-power) (function)
• uf-unit (function)
• (setf uf-unit) (function)
• unit (generic function)
• unit (method)
• (setf unit) (method)
• (setf unit) (generic function)
• unit-definition-conflict-error (condition)
• unit-definition-error (condition)
• unit-definition-semantic-error (condition)
• unit-definition-syntax-error (condition)
• unitp (function)
• units-convertible (function)
• units-equal (function)
• units-equalp (function)
• value (generic function)
• value (method)
• (setf value) (method)
• (setf value) (generic function)
• with-local-units (macro)
• with-saved-units (macro)

Internal Definitions

• *unit-abbreviation-table* (special variable)
• *unit-alias-table* (special variable)
• *unit-prefix-table* (special variable)
• *unit-translation-table* (special variable)
• ae (function)
• beta (function)
• chebyshev-polynomial (function)
• chebyshev-polynomial% (function)
• clear-units (function)
• collect-factors (function)
• confidence-interval (function)
• convert-unit% (function)
• copy-hash-table (function)
• copy-unit (function)
• copy-unit-factor (function)
• define-unit% (function)
• define-unit-prefix% (function)
• dereference-unit (function)
• divide-units (function)
• dup-quantity (macro)
• erf (function)
• error-direct (generic function)
• error-direct (method)
• (setf error-direct) (method)
• (setf error-direct) (generic function)
• error-propagation (macro)
• errorlessp (function)
• eval-quantity (generic function)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• expand-unit (function)
• expand-unit-factor (function)
• f-error (macro)
• has-error-p (function)
• has-key (function)
• has-unit-p (function)
• have (function)
• inverf (function)
• l= (function)
• l> (function)
• ll= (function)
• lookup-unit (function)
• make-quantity% (function)
• make-uf (function)
• mklist (function)
• mkstr (function)
• multiply-units (function)
• nand (macro)
• p-value (function)
• power-unit (function)
• prefix-and (function)
• prefix-base (function)
• prefix-list (function)
• prefix-or (function)
• prefix-range (function)
• py+ (function)
• q-op-insert (function)
• quantile (function)
• quantity-definition-error (condition)
• quantity-definition-semantic-error (condition)
• quantity-definition-syntax-error (condition)
• r-function-a (function)
• r-function-b (function)
• re (function)
• read-quantity (function)
• read-unit (function)
• reduce-unit (function)
• root-unit (function)
• round-to (function)
• sort-unit (function)
• split (function)
• symb (function)
• symbol-prefix (function)
• table-check (function)
• table-insert (function)
• uf-equal (function)
• uf-pow (function)
• unit-factor (structure)
• unit-factor-p (function)
• unit-has-unit-p (function)
• unit-hash-key-check (function)
• unitlessp (function)
• unzip (function)
• with-gensyms (macro)
• with-unit-lookup (macro)
• xnor (function)

5 Definitions

Definitions are sorted by export status, category, package, and then by lexicographic order.

5.1 Exported definitions

5.1.1 Macros

Macro: define-unit NAME &key DEF ALIAS ABBREV PREFIX-TEST OVERWRITE

Package

physical-quantities

Source

unit-database.lisp (file)

Macro: define-unit-prefix NAME POWER &key ABBREV BASE

Package

physical-quantities

Source

unit-database.lisp (file)

Macro: defqop NAME ARG-LIST &body BODY

Package

physical-quantities

Source

numeric.lisp (file)

Macro: mkunit &rest EXPR

Human interface to make a unit.

Package

physical-quantities

Source

units.lisp (file)

Macro: qop QFORM

Package

physical-quantities

Source

numeric.lisp (file)

Macro: quantity &rest EXPR

Function to define quantities without the reader macro.

Package

physical-quantities

Source

quantity.lisp (file)

Macro: with-local-units &body BODY

Shadow the global unit table with a new rule table.

Package

physical-quantities

Source

unit-database.lisp (file)

Macro: with-saved-units &body BODY

Shadow the global unit table with a copy of the unit table. When returninng from the body the original units are restored.

Package

physical-quantities

Source

unit-database.lisp (file)

5.1.2 Functions

Function: convert-to-base-units QUANTITY

Package

physical-quantities

Source

quantity.lisp (file)

Function: convert-unit QUANTITY UNIT

Package

physical-quantities

Source

quantity.lisp (file)

Function: define-read-macros &key QUANTITY UNIT

Lets the user define the #q(...) and #u(...) read macros.

Package

physical-quantities

Source

read-macro.lisp (file)

Function: define-si-units &key CLEAR-EXISTING-UNITS

Package

physical-quantities

Source

si-units.lisp (file)

Function: make-quantity &key VALUE ERROR ERROR-TYPE UNIT

Package

physical-quantities

Source

quantity.lisp (file)

Function: make-unit &rest UNIT-FACTORS

Machine interface for making a unit.

Package

physical-quantities

Source

units.lisp (file)

Function: q* &rest NUMBERS

Package

physical-quantities

Source

numeric.lisp (file)

Function: q+ &rest NUMBERS

Package

physical-quantities

Source

numeric.lisp (file)

Function: q- NUMBER &rest MORE-NUMBERS

Package

physical-quantities

Source

numeric.lisp (file)

Function: q/ NUMBER &rest MORE-NUMBERS

Package

physical-quantities

Source

numeric.lisp (file)

Function: q/= X Y &optional P-VALUE

Package

physical-quantities

Source

numeric.lisp (file)

Function: qabs NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qacos NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qacosh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qasin NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qasinh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qatan NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qatanh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qcos NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qcosh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qequal X Y

Package

physical-quantities

Source

numeric.lisp (file)

Function: qequalp X Y

Package

physical-quantities

Source

numeric.lisp (file)

Function: qexp EXPONENT

Package

physical-quantities

Source

numeric.lisp (file)

Function: qexpt BASE EXPONENT

Package

physical-quantities

Source

numeric.lisp (file)

Function: qln NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qlog NUMBER BASE

Package

physical-quantities

Source

numeric.lisp (file)

Function: qpow BASE POWER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qroot RADICAND DEGREE

Package

physical-quantities

Source

numeric.lisp (file)

Function: qround QUANTITY &key DIGITS PLACE

Package

physical-quantities

Source

numeric.lisp (file)

Function: qsin NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qsinh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qsqrt QUANTITY

Computes the square root of a given quantity. Result must always be real.

Package

physical-quantities

Source

numeric.lisp (file)

Function: qtan NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: qtanh NUMBER

Package

physical-quantities

Source

numeric.lisp (file)

Function: quantityp OBJECT

Package

physical-quantities

Source

quantity.lisp (file)

Function: str-unit OBJ

Prints the given unit in human readable form

Package

physical-quantities

Source

units.lisp (file)

Function: uf-power INSTANCE

Function: (setf uf-power) VALUE INSTANCE

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: uf-unit INSTANCE

Function: (setf uf-unit) VALUE INSTANCE

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: unitp OBJECT

Checks whether an object is a unit.

Package

physical-quantities

Source

units.lisp (file)

Function: units-convertible UNIT-A UNIT-B

Expands and reduces both units and compares the unit factors for equality (in unit and power)

Package

physical-quantities

Source

units.lisp (file)

Function: units-equal UNIT-A UNIT-B

Reduces both units (without converting to base units) and compares the unit factors for equality (in unit and power)

Package

physical-quantities

Source

units.lisp (file)

Function: units-equalp UNIT-A UNIT-B

Reduces both units (converting to base units) and compares the unit factors for equality (in unit and power)

Package

physical-quantities

Source

units.lisp (file)

5.1.3 Generic functions

Generic Function: absolute-error QUANTITY

Generic Function: (setf absolute-error) ERROR QUANTITY

Package

physical-quantities

Source

quantity.lisp (file)

Methods

Method: absolute-error (QUANTITY quantity)

Method: (setf absolute-error) ERROR (QUANTITY quantity)

Generic Function: aerr QUANTITY

Generic Function: (setf aerr) ERROR QUANTITY

Package

physical-quantities

Source

quantity.lisp (file)

Methods

Method: aerr (QUANTITY quantity)

Method: (setf aerr) ERROR (QUANTITY quantity)

Generic Function: q< X Y &optional P-VALUE

Determines whether the one quantity is less than another quantity

Package

physical-quantities

Source

numeric.lisp (file)

Methods

Method: q< (X quantity) (Y quantity) &optional P-VALUE

Method: q< (X real) (Y quantity) &optional P-VALUE

Method: q< (X quantity) (Y real) &optional P-VALUE

Method: q< (X real) (Y real) &optional P-VALUE

Generic Function: q<= X Y &optional P-VALUE

Determines whether the one quantity is less or equal to another quantity

Package

physical-quantities

Source

numeric.lisp (file)

Methods

Method: q<= (X quantity) (Y quantity) &optional P-VALUE

Method: q<= (X real) (Y quantity) &optional P-VALUE

Method: q<= (X quantity) (Y real) &optional P-VALUE

Method: q<= (X real) (Y real) &optional P-VALUE

Generic Function: q= X Y &optional P-VALUE

Determines whether the value of two quantities are equal.

Package

physical-quantities

Source

numeric.lisp (file)

Methods

Method: q= (X quantity) (Y quantity) &optional P-VALUE

Method: q= (X real) (Y quantity) &optional P-VALUE

Method: q= (X quantity) (Y real) &optional P-VALUE

Method: q= (X real) (Y real) &optional P-VALUE

Generic Function: q> X Y &optional P-VALUE

Determines whether the one quantity is greater than another quantity

Package

physical-quantities

Source

numeric.lisp (file)

Methods

Method: q> (X quantity) (Y quantity) &optional P-VALUE

Method: q> (X real) (Y quantity) &optional P-VALUE

Method: q> (X quantity) (Y real) &optional P-VALUE

Method: q> (X real) (Y real) &optional P-VALUE

Generic Function: q>= X Y &optional P-VALUE

Determines whether the one quantity is greater or equal to another quantity

Package

physical-quantities

Source

numeric.lisp (file)

Methods

Method: q>= (X quantity) (Y quantity) &optional P-VALUE

Method: q>= (X real) (Y quantity) &optional P-VALUE

Method: q>= (X quantity) (Y real) &optional P-VALUE

Method: q>= (X real) (Y real) &optional P-VALUE

Generic Function: relative-error QUANTITY

Generic Function: (setf relative-error) ERROR QUANTITY

Package

physical-quantities

Source

quantity.lisp (file)

Methods

Method: relative-error (QUANTITY quantity)

Method: (setf relative-error) ERROR (QUANTITY quantity)

Generic Function: rerr QUANTITY

Generic Function: (setf rerr) ERROR QUANTITY

Package

physical-quantities

Source

quantity.lisp (file)

Methods

Method: rerr (QUANTITY quantity)

Method: (setf rerr) ERROR (QUANTITY quantity)

Generic Function: unit OBJECT

Generic Function: (setf unit) NEW-VALUE OBJECT

Package

physical-quantities

Methods

Method: unit (QUANTITY quantity)

automatically generated reader method

Source

quantity.lisp (file)

Method: (setf unit) NEW-VALUE (QUANTITY quantity)

automatically generated writer method

Source

quantity.lisp (file)

Generic Function: value OBJECT

Generic Function: (setf value) NEW-VALUE OBJECT

Package

physical-quantities

Methods

Method: value (QUANTITY quantity)

automatically generated reader method

Source

quantity.lisp (file)

Method: (setf value) NEW-VALUE (QUANTITY quantity)

automatically generated writer method

Source

quantity.lisp (file)

5.1.4 Conditions

Condition: error-propagation-error ()

Error for situations in which the propagation of uncertainty is undefined

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

physical-quantities-error (condition)

Condition: invalid-unit-conversion-error ()

Error when converting between incompatible units

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

invalid-unit-error (condition)

Condition: invalid-unit-error ()

Generic unit error

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

physical-quantities-error (condition)

Direct subclasses

• invalid-unit-operation-error (condition)
• invalid-unit-conversion-error (condition)
• invalid-unit-reference-error (condition)

Condition: invalid-unit-operation-error ()

Error for situations in which the unit is invalid in a given operation

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

invalid-unit-error (condition)

Condition: invalid-unit-reference-error ()

Unit lookup error

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

invalid-unit-error (condition)

Condition: operation-undefined-error ()

Error for situations in which an operation is undefined

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

physical-quantities-error (condition)

Condition: physical-quantities-error ()

Generic error for the physical quantities library.

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

simple-error (condition)

Direct subclasses

• unit-definition-error (condition)
• operation-undefined-error (condition)
• invalid-unit-error (condition)
• error-propagation-error (condition)
• quantity-definition-error (condition)

Condition: unit-definition-conflict-error ()

Name conflict for the definition of a unit/prefix

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

unit-definition-error (condition)

Condition: unit-definition-error ()

Generic error for unit/prefix definitions.

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

physical-quantities-error (condition)

Direct subclasses

• unit-definition-syntax-error (condition)
• unit-definition-semantic-error (condition)
• unit-definition-conflict-error (condition)

Condition: unit-definition-semantic-error ()

Semantic error in the definition of a unit/prefix

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

unit-definition-error (condition)

Condition: unit-definition-syntax-error ()

Syntax error in the definition of a unit/prefix

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

unit-definition-error (condition)

5.1.5 Classes

Class: quantity ()

Package

physical-quantities

Source

quantity.lisp (file)

Direct superclasses

standard-object (class)

Direct methods

• q>= (method)
• q>= (method)
• q>= (method)
• q> (method)
• q> (method)
• q> (method)
• q<= (method)
• q<= (method)
• q<= (method)
• q< (method)
• q< (method)
• q< (method)
• q= (method)
• q= (method)
• q= (method)
• eval-quantity (method)
• eval-quantity (method)
• eval-quantity (method)
• relative-error (method)
• absolute-error (method)
• relative-error (method)
• absolute-error (method)
• print-object (method)
• unit (method)
• unit (method)
• error-direct (method)
• error-direct (method)
• value (method)
• value (method)

Direct slots

Slot: value

Initargs

:value

Initform

0

Readers

value (generic function)

Writers

(setf value) (generic function)

Slot: error

Initargs

:error

Initform

0

Readers

error-direct (generic function)

Writers

(setf error-direct) (generic function)

Slot: unit

Initargs

:unit

Readers

unit (generic function)

Writers

(setf unit) (generic function)

5.2 Internal definitions

5.2.1 Special variables

Special Variable: *unit-abbreviation-table*

Package

physical-quantities

Source

unit-database.lisp (file)

Special Variable: *unit-alias-table*

Package

physical-quantities

Source

unit-database.lisp (file)

Special Variable: *unit-prefix-table*

Package

physical-quantities

Source

unit-database.lisp (file)

Special Variable: *unit-translation-table*

Package

physical-quantities

Source

unit-database.lisp (file)

5.2.2 Macros

Macro: dup-quantity Q &key V E U

Package

physical-quantities

Source

numeric.lisp (file)

Macro: error-propagation &rest VAR-DERIVATIVE-PAIRS

Package

physical-quantities

Source

numeric.lisp (file)

Macro: f-error TYPE (&rest INITARGS) CONTROL &rest ARGS

Like (error ...), but allows the condition type to be specified (which is required to inherit from simple-condition).

Package

physical-quantities

Source

conditions.lisp (file)

Macro: nand &rest FORMS

Package

physical-quantities

Source

utils.lisp (file)

Macro: with-gensyms (&rest NAMES) &body BODY

Package

physical-quantities

Source

utils.lisp (file)

Macro: with-unit-lookup (BASE-UNIT TRANSLATION UNIT) &body BODY

Package

physical-quantities

Source

unit-database.lisp (file)

5.2.3 Functions

Function: ae VAL ERR

Package

physical-quantities

Source

quantity.lisp (file)

Function: beta X

Helper for the inverf function.

Package

physical-quantities

Source

utils.lisp (file)

Function: chebyshev-polynomial N X

Evaluates the nth Chebyshev polynomial.

Package

physical-quantities

Source

utils.lisp (file)

Function: chebyshev-polynomial% N X A B

Recursion function for the Chebyshev polynomial evaluation.

Package

physical-quantities

Source

utils.lisp (file)

Function: clear-units ()

Package

physical-quantities

Source

unit-database.lisp (file)

Function: collect-factors F &rest EXPANDED-UNIT-FACTORS

Package

physical-quantities

Source

units.lisp (file)

Function: confidence-interval CONFIDENCE-VALUE &key TWO-SIDED

Package

physical-quantities

Source

utils.lisp (file)

Function: convert-unit% VALUE UNIT-A UNIT-B

Applies the conversion factor between unit-a and unit-b to the given value.

Package

physical-quantities

Source

units.lisp (file)

Function: copy-hash-table HASH-TABLE

Creates a copy of the given hash table.

Package

physical-quantities

Source

utils.lisp (file)

Function: copy-unit UNIT

Creates a copy of the given unit.

Package

physical-quantities

Source

units.lisp (file)

Function: copy-unit-factor INSTANCE

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: define-unit% NAME &key DEF ALIASES ABBREVIATIONS PREFIX-TEST OVERWRITE

Defines a new unit with the identifier name. A list of aliases and a list of abbreviations are permitted which - when encountered - are internally converted to the primary identifier. The definition allows the unit to be defined in terms of other units, e.g :def (1.602 kilometre). Prefixes is must be a function of two parameters, the base and the power, with which it decides whether a prefix is allowed for the unit. It defaults to allowing all defined prefixes.

Package

physical-quantities

Source

unit-database.lisp (file)

Function: define-unit-prefix% NAME POWER &key ABBREV BASE

Defines a unit prefix such as kilo in kilometre. Apart from the name the power is required (3 for kilo) together with the base that defaults to 10. An abbreviation for the prefix is also allowed which will be used in combination with abbreviated units.

Package

physical-quantities

Source

unit-database.lisp (file)

Function: dereference-unit UNIT

Takes a unit and looks up aliases and abbreviations of unit factors and replaces them with the main unit designators.

Package

physical-quantities

Source

units.lisp (file)

Function: divide-units &rest UNITS

Divides the given units with each, reducing the result.

Package

physical-quantities

Source

units.lisp (file)

Function: erf X

Calculates the error function.

Package

physical-quantities

Source

utils.lisp (file)

Function: errorlessp QUANTITY

Checks whether a quantity is without uncertainty/error.

Package

physical-quantities

Source

quantity.lisp (file)

Function: expand-unit UNIT

Expands the given unit into base units and reduces them

Package

physical-quantities

Source

units.lisp (file)

Function: expand-unit-factor FACTOR

Converts a single unit factor into its expansion of base units, together with a conversion factor

Package

physical-quantities

Source

units.lisp (file)

Function: has-error-p QUANTITY

Checks whether a quantity has uncertainty/error.

Package

physical-quantities

Source

quantity.lisp (file)

Function: has-key KEY HASH-TABLE

Package

physical-quantities

Source

utils.lisp (file)

Function: has-unit-p QUANTITY

Checks whether the given quantity has a unit.

Package

physical-quantities

Source

quantity.lisp (file)

Function: have ITEM SEQUENCE &key TEST KEY

Package

physical-quantities

Source

utils.lisp (file)

Function: inverf X

Inverse error function.

Package

physical-quantities

Source

utils.lisp (file)

Function: l= LIST LENGTH

Tests efficiently whether the length of the list is equal to the given length.

Package

physical-quantities

Source

utils.lisp (file)

Function: l> LIST LENGTH

Tests efficiently whether the length of the list is greater than the given length.

Package

physical-quantities

Source

utils.lisp (file)

Function: ll= LIST-A LIST-B

Tests efficiently whether the length of list-a is equal to the length of list-b.

Package

physical-quantities

Source

utils.lisp (file)

Function: lookup-unit UNIT

Package

physical-quantities

Source

unit-database.lisp (file)

Function: make-quantity% &key VALUE ERROR UNIT

Package

physical-quantities

Source

quantity.lisp (file)

Function: make-uf UNIT POWER

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: mklist OBJ

Makes a list out of the given object unless it already is a list.

Package

physical-quantities

Source

utils.lisp (file)

Function: mkstr &rest ARGS

Package

physical-quantities

Source

utils.lisp (file)

Function: multiply-units &rest UNITS

Multiplies units with each other and reduces the result.

Package

physical-quantities

Source

units.lisp (file)

Function: p-value X

Package

physical-quantities

Source

utils.lisp (file)

Function: power-unit UNIT POWER

Raises the unit to the given power.

Package

physical-quantities

Source

units.lisp (file)

Function: prefix-and &rest FUNCTIONS

Package

physical-quantities

Source

unit-database.lisp (file)

Function: prefix-base BASE &optional MOD

Package

physical-quantities

Source

unit-database.lisp (file)

Function: prefix-list BASE &rest POWERS

Package

physical-quantities

Source

unit-database.lisp (file)

Function: prefix-or &rest FUNCTIONS

Package

physical-quantities

Source

unit-database.lisp (file)

Function: prefix-range BASE POWER-MIN POWER-MAX

Package

physical-quantities

Source

unit-database.lisp (file)

Function: py+ &rest NUMBERS

Pythagorean addition

Package

physical-quantities

Source

utils.lisp (file)

Function: q-op-insert TREE

Package

physical-quantities

Source

numeric.lisp (file)

Function: quantile P

Calculates the quantile for the normal distribution.

Package

physical-quantities

Source

utils.lisp (file)

Function: r-function-a X

Helper for the inverf function.

Package

physical-quantities

Source

utils.lisp (file)

Function: r-function-b X

Helper for the inverf function.

Package

physical-quantities

Source

utils.lisp (file)

Function: re VAL ERR

Package

physical-quantities

Source

quantity.lisp (file)

Function: read-quantity STREAM CHAR1 CHAR2

The read macro #q(...) is an abbreviation for (quantity ...) which does not transform lowercase symbols to uppercase for unit factors.

Package

physical-quantities

Source

read-macro.lisp (file)

Function: read-unit STREAM CHAR1 CHAR2

The read macro #u(...) is an abbreviation for (mkunit ...) which does not transform lowercase symbols to uppercase.

Package

physical-quantities

Source

read-macro.lisp (file)

Function: reduce-unit UNIT

Reduces the powers of duplicate unit factors in a given unit, e.g. km^2 / km -> km, but m / km -> m / km. No unit lookup is made.

Package

physical-quantities

Source

units.lisp (file)

Function: root-unit UNIT INDEX

Extracts the root from the given unit if possible. Converts to base units if necessary.

Package

physical-quantities

Source

units.lisp (file)

Function: round-to NUMBER DIGITS &optional PLACE

Package

physical-quantities

Source

numeric.lisp (file)

Function: sort-unit UNIT

Sorts the unit by positive and negative powers.

Package

physical-quantities

Source

units.lisp (file)

Function: split TEST SEQUENCE &key KEY

Package

physical-quantities

Source

utils.lisp (file)

Function: symb &rest ARGS

Package

physical-quantities

Source

utils.lisp (file)

Function: symbol-prefix PREFIX SYMBOLS

Package

physical-quantities

Source

unit-database.lisp (file)

Function: table-check NAME ALIASES ABBREVS

Package

physical-quantities

Source

unit-database.lisp (file)

Function: table-insert NAME ALIASES ABBREVS DEF

Package

physical-quantities

Source

unit-database.lisp (file)

Function: uf-equal A B

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: uf-pow UNIT-FACTOR POWER

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: unit-factor-p OBJECT

Package

physical-quantities

Source

unit-factor.lisp (file)

Function: unit-has-unit-p UNIT

Package

physical-quantities

Source

units.lisp (file)

Function: unit-hash-key-check KEY

Package

physical-quantities

Source

unit-database.lisp (file)

Function: unitlessp QUANTITY

Checks whether the given quantity is unitless.

Package

physical-quantities

Source

quantity.lisp (file)

Function: unzip LIST

Package

physical-quantities

Source

utils.lisp (file)

Function: xnor &rest FORMS

Package

physical-quantities

Source

utils.lisp (file)

5.2.4 Generic functions

Generic Function: error-direct OBJECT

Generic Function: (setf error-direct) NEW-VALUE OBJECT

Package

physical-quantities

Methods

Method: error-direct (QUANTITY quantity)

automatically generated reader method

Source

quantity.lisp (file)

Method: (setf error-direct) NEW-VALUE (QUANTITY quantity)

automatically generated writer method

Source

quantity.lisp (file)

Generic Function: eval-quantity VALUE ERROR UNIT-A UNIT-B

Package

physical-quantities

Source

quantity.lisp (file)

Methods

Method: eval-quantity (Q quantity) (ERROR (eql 0)) (UNIT-A (eql nil)) UNIT-B

Method: eval-quantity (Q quantity) (ERROR (eql 0)) UNIT-A (UNIT-B (eql nil))

Method: eval-quantity (VALUE quantity) (ERROR (eql 0)) (UNIT-A (eql nil)) (UNIT-B (eql nil))

Method: eval-quantity (VALUE number) (ERROR number) UNIT-A UNIT-B

Method: eval-quantity (VALUE number) (ERROR number) UNIT-A (UNIT-B (eql nil))

5.2.5 Conditions

Condition: quantity-definition-error ()

Generic error for quantity definitions.

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

physical-quantities-error (condition)

Direct subclasses

• quantity-definition-syntax-error (condition)
• quantity-definition-semantic-error (condition)

Condition: quantity-definition-semantic-error ()

Semantic error in the definition of a quantity/unit

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

quantity-definition-error (condition)

Condition: quantity-definition-syntax-error ()

Syntax error in the definition of a quantity/unit

Package

physical-quantities

Source

conditions.lisp (file)

Direct superclasses

quantity-definition-error (condition)

5.2.6 Structures

Structure: unit-factor ()

Package

physical-quantities

Source

unit-factor.lisp (file)

Direct superclasses

structure-object (structure)

Direct slots

Slot: unit

Type

string

Initform

""

Readers

uf-unit (function)

Writers

(setf uf-unit) (function)

Slot: power

Type

integer

Initform

0

Readers

uf-power (function)

Writers

(setf uf-power) (function)

Appendix A Indexes

A.1 Concepts

A.2 Functions