Content-type: text/html Man page of atan

atan

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
Index Return to Main Contents
 

NAME

atan, atanf, atanl - arc tangent function  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double atan(double x);

float atanf(float x);

long double atanl(long double x);  

DESCRIPTION

These functions compute the principal value of the arc tangent of x.  

RETURN VALUES

Upon successful completion, these functions return the arc tangent of x in the range [-pi/2,pi/2] radians.

If x is NaN, NaN is returned.

If x is ±0, x is returned.

If x is ±Inf, ±pi/2 is returned.  

ERRORS

No errors are defined.  

ATTRIBUTES

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

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

atan2(3M), isnan(3M), math.h(3HEAD), tan(3M), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO

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Time: 02:39:33 GMT, October 02, 2010