atan

Type:	-	function (subr)
Source:	-	xlmath.c

Syntax

(atan expr [expr2])

expr - the value of x as a floating point number/expression
expr2 - the value of y (default value is 1.0)
returns - the arctangent of x/y

Description

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

Examples

(atan  0.0)   ; returns  0
(atan  1.0)   ; returns  0.785398
(atan -1.0)   ; returns -0.785398
(atan    0)   ; returns  0

See the atan function in the XLISP 2.0 manual.

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