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-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
-.\" Modified 2002-07-27 by Walter Harms
-.\" 	(walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH LOG 3  2010-09-20  "" "Linux Programmer's Manual"
-.SH NAME
-log, logf, logl \- natural logarithmic function
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.sp
-.BI "double log(double " x );
-.br
-.BI "float logf(float " x );
-.br
-.BI "long double logl(long double " x );
-.fi
-.sp
-Link with \fI\-lm\fP.
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.BR logf (),
-.BR logl ():
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
-.RE
-.ad
-.SH DESCRIPTION
-The
-.BR log ()
-function returns the natural logarithm of
-.IR x .
-.SH RETURN VALUE
-On success, these functions return the natural logarithm of
-.IR x .
-
-If
-.I x
-is a NaN,
-a NaN is returned.
-
-If
-.I x
-is 1, the result is +0.
-
-If
-.I x
-is positive infinity,
-positive infinity is returned.
-
-If
-.I x
-is zero,
-then a pole error occurs, and the functions return
-.RB - HUGE_VAL ,
-.RB - HUGE_VALF ,
-or
-.RB - HUGE_VALL ,
-respectively.
-
-If
-.I x
-is negative (including negative infinity), then
-a domain error occurs, and a NaN (not a number) is returned.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.PP
-The following errors can occur:
-.TP
-Domain error: \fIx\fP is negative
-.I errno
-is set to
-.BR EDOM .
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.TP
-Pole error: \fIx\fP is zero
-.I errno
-is set to
-.BR ERANGE .
-A divide-by-zero floating-point exception
-.RB ( FE_DIVBYZERO )
-is raised.
-.SH CONFORMING TO
-C99, POSIX.1-2001.
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH BUGS
-In glibc 2.5 and earlier,
-taking the
-.BR log ()
-of a NaN produces a bogus invalid floating-point
-.RB ( FE_INVALID )
-exception.
-.SH SEE ALSO
-.BR cbrt (3),
-.BR clog (3),
-.BR log10 (3),
-.BR log1p (3),
-.BR log2 (3),
-.BR sqrt (3)
-.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/.