Compute the complex arc tangent
#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.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
The complex arc tangent of z, in the range of a strip unbounded along the imaginary axis and in the interval [−π/2; +π/2] along the real axis.
Errors and special cases are handled as if the operation were implemented as -i * catanh(i * z).
These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |