ATAN2(3)

NAME
atan2, atan2f - arc tangent of y/x

SYNOPSIS

#include <math.h>

double atan2(double y, double x);

float atan2f(float y, float x);

DESCRIPTION

atan2 computes the inverse tangent (arc tangent) of y/x. atan2 produces the correct result even for angles near pi/2 or -pi/2 (that is, when x is near 0).

atan2f is identical to atan2, save that it takes and returns float.

RETURNS

atan2 and atan2f return a value in radians, in the range of -pi to pi.

You can modify error handling for these functions using matherr.

PORTABILITY

atan2 is ANSI C. atan2f is an extension.