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, +++++????i ] 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 [ −??/2, +??/2 ] along the real axis.
No errors are defined.
See attributes(5) for descriptions of the following attributes: