atan2(3) -- Linux man page
NAME
atan2, atan2f, atan2l - arc tangent function of two variables
SYNOPSIS
#include <math.h>
double atan2(double y, double x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);
DESCRIPTION
The atan2() function calculates the arc tangent of the two
variables x and y. It is similar to calculating the
arc tangent of y / x, except that the signs of both
arguments are used to determine the quadrant of the result.
RETURN VALUE
The atan2() function returns the result in radians, which
is between -PI and PI (inclusive).
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899.
The float and long double variants are C99 requirements.
SEE ALSO
acos(3),
asin(3),
atan(3),
cos(3),
sin(3),
tan(3)
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