atan() -- Mathematics Function (libm)

Calculate inverse tangent
#include <math.h>
double atan(arg) double arg;

atan() calculates the inverse tangent of arg, which may be any real number.
The result will be in the range [-pi/2, pi/2].

Example

For an example of this function, see the entry for acos().

See Also

errno,
libm,
tan(),
ANSI Standard, §7.5.2.3
POSIX Standard, §8.1

© 2012 by Stephen A. Ness