catan(), catanf(), catanl() — Calculate the complex arc tangent

Standards

Standards / Extensions	C or C++	Dependencies
C99 Single UNIX Specification, Version 3	both	z/OS V1R7 a compiler that is designed to support C99

Format

#include <complex.h>

double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);

General description

The catan() family of functions compute the complex arc tangent of z, with branch cuts outside the interval [-i, +i] along the imaginary axis.

Note: The following table shows the viable formats for these functions. See IEEE binary floating-point for more information about IEEE Binary Floating-Point.

Function	Hex	IEEE
catan	X	X
catanf	X	X
catanl	X	X

Returned value

The catan() family of functions return the complex arc tangent value, in the range of a strip, mathematically unbounded along the imaginary axis and in the interval [-π/2, +π/2] along the real axis.

Example

For an example of a similar function see cacos(), cexp() or cpow().