clog

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

#include <complex.h> I double complex clog(double complex z );
I float complex clogf(float complex z );
I long double complex clogl(long double complex z ); Link with -lm.

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 [-pi,pi].

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

Note that z close to zero will cause an overflow.

C99

cabs(3), cexp(3), clog10(3), complex(7)