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[linuxjm/LDP_man-pages.git] / original / man3 / clog.3

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-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
-.\" Distributed under GPL
-.\" %%%LICENSE_END
-.\"
-.TH CLOG 3 2008-08-11 "" "Linux Programmer's Manual"
-.SH NAME
-clog, clogf, clogl \- natural logarithm of a complex number
-.SH SYNOPSIS
-.B #include <complex.h>
-.sp
-.BI "double complex clog(double complex " z );
-.br
-.BI "float complex clogf(float complex " z );
-.br
-.BI "long double complex clogl(long double complex " z );
-.sp
-Link with \fI\-lm\fP.
-.SH DESCRIPTION
-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].
-.LP
-One has:
-.nf
-
-    clog(z) = log(cabs(z)) + I * carg(z)
-.fi
-.LP
-Note that
-.I z
-close to zero will cause an overflow.
-.SH VERSIONS
-These functions first appeared in glibc in version 2.1.
-.SH CONFORMING TO
-C99.
-.SH SEE ALSO
-.BR cabs (3),
-.BR cexp (3),
-.BR clog10 (3),
-.BR clog2 (3),
-.BR complex (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.