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Manpage of ATAN2

ATAN2

Index
 

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 fBatan2()fP function calculates the arc tangent of the two variables fIxfP and fIyfP. It is similar to calculating the arc tangent of fIyfP / fIxfP, except that the signs of both arguments are used to determine the quadrant of the result.  

RETURN VALUE

The fBatan2()fP 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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
SEE ALSO