diff options
| -rw-r--r-- | chickadee/math.scm | 2 | ||||
| -rw-r--r-- | doc/api.texi | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/chickadee/math.scm b/chickadee/math.scm index 050dac1..b970526 100644 --- a/chickadee/math.scm +++ b/chickadee/math.scm @@ -18,6 +18,7 @@ (define-module (chickadee math) #:export (pi pi/2 + 2pi cotan square clamp @@ -30,6 +31,7 @@ (define pi 3.14159265358979323846) (define pi/2 (/ pi 2.0)) +(define 2pi (* pi 2.0)) (define-inlinable (cotan z) "Return the cotangent of Z." diff --git a/doc/api.texi b/doc/api.texi index f553f25..3992c06 100644 --- a/doc/api.texi +++ b/doc/api.texi @@ -571,6 +571,10 @@ approximation that is ``good enough.'' Half of @var{pi}. @end defvar +@defvar 2pi +Twice @var{pi}. +@end defvar + @deffn {Procedure} cotan z Return the cotangent of @var{z}. @end deffn |