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atan

atan

type: function (subr) 
location: built-in
source file: xlmath.c
Common LISP compatible: yes
supported on: all machines

SYNTAX

(atan <expr> )
      <expr>          -       floating point number/expression

DESCRIPTION

The atan function returns the arc tangent of the <expr>. The result is in radians.

EXAMPLES

(atan  0.0)                             ; returns  0.0
(atan  1.0)                             ; returns  0.785398
(atan -1.0)                             ; returns -0.785398
(atan    0)				; error: bad integer operation


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