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double complex clog(double complex z);
float complex clogf(float complex z);
long double complex clogl(long double complex z);
Link with -lm.
The logarithm clog() is the inverse function of the exponential
cexp(3). Thus, if y = clog(z), then z = cexp(y). The imaginary part
of y is chosen in the interval [-pi,pi].
clog(z) = log(cabs(z)) + I * carg(z)
Note that z close to zero will cause an overflow.
These functions first appeared in glibc in version 2.1.
cabs(3), cexp(3), clog10(3), clog2(3), complex(7)