atan(3M)

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

NAME

atan- arc tangent function of one variable

SYNOPSIS

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

double atan(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 atan() function computes the principal value of the arc tangent of x. For information about errors due to rounding off, see Intro(3M).

RETURN VALUES

The atan() function returns the arc tangent in radians.

ATTRIBUTES

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

acos(3M), asin(3M), atan2(3M), cos(3M), cosh(3M), sin(3M), sinh(3M), tan(3M), tanh(3M), Intro(3M)

STANDARDS

The atan() function conforms to ANSI-C.

ChorusOS 5.0  Last Revised December 2001

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