ATAN(3) Linux Programmer's Manual ATAN(3)[top]NAMEatan, atanf,atanl- arc tangent functionSYNOPSIS#include <math.h> double atan(double x); float atanf(float x); long double atanl( long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): atanf(), atanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99-lm.DESCRIPTIONThe atan() function calculates the principal value of the arc tangent of x; that is the value whose tangent is x.RETURN VALUEOn success, these functions return the principal value of the arc tan‐ gent of x in radians; the return value is in the range [-pi/2, pi/2]. If x is a NaN, a NaN is returned. If x is +0 (-0), +0 (-0) is returned. If x is positive infinity (negative infinity), +pi/2 (-pi/2) is returned.ERRORSNo errors occur.CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.SEE ALSOacos(3), asin(3), atan2(3), carg(3), catan(3), cos(3), sin(3), tan(3)COLOPHONThis page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-12-02 ATAN(3)

List of man pages available for

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]

Polar

Member of Polar

Based on Fawad Halim's script.

....................................................................

Vote for polarhome |