NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | STANDARDS
#include <math.h>double atan2(double y, double x);
The atan2 function computes the principal value of the arc tangent of y/x, using the signs of both arguments to determine the quadrant of the return value.
The atan2 function, if successful, returns the arc tangent of y/x in radians. If both x and y are zero, errno is set to EDOM and a system-dependent notification is performed.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
---|---|
Interface Stability | Evolving |
The atan2 function conforms to ANSI-C.
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | STANDARDS