clog - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <complex.h>double complex clog(double complex z); float complex clogf(float complex z); long double complex clogl(long double complex z);

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DESCRIPTIONThese functions calculate the complex natural logarithm of z, with a branch cut along the negative real axis. 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]. One has: clog(z) = log(cabs(z)) + I * carg(z)Note that z close to zero will cause an overflow.

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue clog(), clogf(), clogl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008.

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SEE ALSOcabs(3), cexp(3), clog10(3), clog2(3), complex(7) 0

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