c99 [ flag... ] file... -lm [ library... ] #include <complex.h>
double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
These functions compute the complex arc tangent of z, with branch cuts outside the interval [ -i, +++++pipii ] along the imaginary axis.
These functions return the complex arc tangent value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [ -pi/2, +pi/2 ] along the real axis.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | MT-Safe |
complex.h(3HEAD), ctan(3M), attributes(5), standards(5)