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