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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH clog 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-clog, clogf, clogl \- natural logarithm of a complex number
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.P
-.BI "double complex clog(double complex " z );
-.BI "float complex clogf(float complex " z );
-.BI "long double complex clogl(long double complex " z );
-.fi
-.SH DESCRIPTION
-These functions calculate the complex natural logarithm of
-.IR z ,
-with a branch cut along the negative real axis.
-.P
-The logarithm
-.BR clog ()
-is the inverse function of the exponential
-.BR cexp (3).
-Thus, if \fIy\ =\ clog(z)\fP, then \fIz\ =\ cexp(y)\fP.
-The imaginary part of
-.I y
-is chosen in the interval [\-pi,pi].
-.P
-One has:
-.P
-.in +4n
-.EX
-clog(z) = log(cabs(z)) + I * carg(z)
-.EE
-.in
-.P
-Note that
-.I z
-close to zero will cause an overflow.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR clog (),
-.BR clogf (),
-.BR clogl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH SEE ALSO
-.BR cabs (3),
-.BR cexp (3),
-.BR clog10 (3),
-.BR clog2 (3),
-.BR complex (7)