CentOS 7.0 - man page for clogf (centos section 3)
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CLOG(3) Linux Programmer's Manual CLOG(3)
clog, clogf, clogl - natural logarithm of a complex number
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
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)
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