clog, clogf, clogl − natural logarithm of a complex number

#include <complex.h>

double complex clog(double complexz);

float complex clogf(float complex z);

long double complex clogl(long double complexz);

The logarithm clog is the inverse function of the exponential cexp. Thus, if y = clog(z), then z = cexp(y). The imaginary part of y is chosen in the interval [-I*pi,I*pi].

One has clog(z) = log(cabs(z))+I*carg(z).

Please note that z close to zero will cause an overflow.

C99

cabs(3), cexp(3), clog10(3)