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* lisp/calc/calc-units.el (math-standard-units): Document.

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Some guesswork, but at least it helps someone trying to make sense of
it next time.
This commit is contained in:
Mattias Engdegård 2023-10-10 13:50:44 +02:00
parent 36d47f24db
commit 2c6015437e
1 changed files with 15 additions and 1 deletions
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16
lisp/calc/calc-units.el
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@ -307,8 +307,22 @@
"22.710947 10^-3 m^3/mol (*)")
;; Logarithmic units
( Np nil "*Neper")
( dB "(ln(10)/20) Np" "decibel")))
( dB "(ln(10)/20) Np" "decibel"))
"List of predefined units for Calc.
Each element is (NAME DEF DESC TEMP-UNIT HUMAN-DEF), where:
NAME is the unit symbol.
DEF is a string defining the unit as a Calc expression; nil if base unit.
DESC is a string describing the unit (to a human reader).
A leading asterisk indicates that the unit is first in its group.
TEMP-UNIT is an additional symbol tabulated for temperature units (?) or nil.
HUMAN-DEF is a string defining the unit (to a human reader).
If absent or nil, DEF is used.
(*) in HUMAN-DEF means that the definition is approximate, otherwise exact.
(**) in DESC means that the unit name is different in TeX and LaTeX
display modes.")
(defvar math-additional-units nil
"Additional units table for user-defined units.