atan2(3M)

NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | STANDARDS

NAME

atan2- arc tangent function of two variables

SYNOPSIS

$(NUCLEUS_DIR)/lib/libm.a
#include <math.h>

double atan2(double y, double x);

API RESTRICTIONS

The function or functions documented here may not be used safely in all application contexts with all APIs provided in the ChorusOS 5.0 product.

See API(5FEA) for details.

DESCRIPTION

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.

RETURN VALUES

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.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

acos(3M), asin(3M), atan(3M), cos(3M), cosh(3M), sin(3M), sinh(3M), tan(3M), tanh(3M), Intro(3M)

STANDARDS

The atan2() function conforms to ANSI-C.

ChorusOS 5.0  Last Revised December 2001

NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | STANDARDS