diff options
Diffstat (limited to 'lib/stdlib/doc/src/math.xml')
| -rw-r--r-- | lib/stdlib/doc/src/math.xml | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/lib/stdlib/doc/src/math.xml b/lib/stdlib/doc/src/math.xml index 59a05a4e5a..69df237496 100644 --- a/lib/stdlib/doc/src/math.xml +++ b/lib/stdlib/doc/src/math.xml @@ -5,7 +5,7 @@ <header> <copyright> <year>1996</year> - <year>2020</year> + <year>2023</year> <holder>Ericsson AB, All Rights Reserved</holder> </copyright> <legalnotice> @@ -102,9 +102,20 @@ erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.</pre> <func> <name name="pi" arity="0" since=""/> - <fsummary>A useful number.</fsummary> + <fsummary>Ratio of the circumference of a circle to its diameter.</fsummary> <desc> - <p>A useful number.</p> + <p>Ratio of the circumference of a circle to its diameter.</p> + <p>Floating point approximation of mathematical constant pi.</p> + </desc> + </func> + + <func> + <name name="tau" arity="0" since="OTP @OTP-18361@"/> + <fsummary>Ratio of the circumference of a circle to its radius.</fsummary> + <desc> + <p>Ratio of the circumference of a circle to its radius.</p> + <p>This constant is equivalent to a full turn when described in radians.</p> + <p>The same as <c>2 * pi()</c>.</p> </desc> </func> |