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-'\" t
-.\" Copyright 1995 Jim Van Zandt <jrv@vanzandt.mv.com>
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified 2002-07-27 by Walter Harms
-.\" (walter.harms@informatik.uni-oldenburg.de)
-.TH log1p 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-log1p, log1pf, log1pl \- logarithm of 1 plus argument
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double log1p(double " x );
-.BI "float log1pf(float " x );
-.BI "long double log1pl(long double " x );
-.P
-.fi
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.nf
-.BR log1p ():
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || _XOPEN_SOURCE >= 500
-.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR log1pf (),
-.BR log1pl ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return a value equivalent to
-.P
-.nf
- log (1 + \fIx\fP)
-.fi
-.P
-The result is computed in a way
-that is accurate even if the value of
-.I x
-is near zero.
-.SH RETURN VALUE
-On success, these functions return the natural logarithm of
-.IR "(1\ +\ x)" .
-.P
-If
-.I x
-is a NaN,
-a NaN is returned.
-.P
-If
-.I x
-is positive infinity, positive infinity is returned.
-.P
-If
-.I x
-is \-1, a pole error occurs,
-and the functions return
-.RB \- HUGE_VAL ,
-.RB \- HUGE_VALF ,
-or
-.RB \- HUGE_VALL ,
-respectively.
-.P
-If
-.I x
-is less than \-1 (including negative infinity),
-a domain error occurs,
-and a NaN (not a number) is returned.
-.\" POSIX.1 specifies a possible range error if x is subnormal
-.\" glibc 2.8 doesn't do this
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Domain error: \fIx\fP is less than \-1
-.I errno
-is set to
-.B EDOM
-(but see BUGS).
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised.
-.TP
-Pole error: \fIx\fP is \-1
-.I errno
-is set to
-.B ERANGE
-(but see BUGS).
-A divide-by-zero floating-point exception
-.RB ( FE_DIVBYZERO )
-is raised.
-.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 log1p (),
-.BR log1pf (),
-.BR log1pl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.\" BSD
-.SH BUGS
-Before glibc 2.22, the glibc implementation did not set
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6792
-.I errno
-to
-.B EDOM
-when a domain error occurred.
-.P
-Before glibc 2.22, the glibc implementation did not set
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6792
-.I errno
-to
-.B ERANGE
-when a range error occurred.
-.SH SEE ALSO
-.BR exp (3),
-.BR expm1 (3),
-.BR log (3)