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Manual

clog

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

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

LIBRARY

Math library ( libm , -lm )

SYNOPSIS

#include <complex.h>

double complex clog(double complex z );
float complex clogf(float complex z );
long double complex clogl(long double complex z );

DESCRIPTION

These 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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

Image grohtml-82302-1.png

STANDARDS

C11, POSIX.1-2008.

HISTORY

glibc 2.1. C99, POSIX.1-2001.

SEE ALSO

cabs (3), cexp (3), clog10 (3), clog2 (3), complex (7)