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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 Walter Harms
-.\" (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH expm1 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-expm1, expm1f, expm1l \- exponential minus 1
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double expm1(double " x );
-.BI "float expm1f(float " x );
-.BI "long double expm1l(long double " x );
-.P
-.fi
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR expm1 ():
-.nf
- _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 expm1f (),
-.BR expm1l ():
-.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
- exp(x) \- 1
-.fi
-.P
-The result is computed in a way that is accurate even if the value of
-.I x
-is near
-zero\[em]a case where
-.I "exp(x) \- 1"
-would be inaccurate due to
-subtraction of two numbers that are nearly equal.
-.SH RETURN VALUE
-On success, these functions return
-.IR "exp(x)\ \-\ 1" .
-.P
-If
-.I x
-is a NaN,
-a NaN is returned.
-.P
-If
-.I x
-is +0 (\-0),
-+0 (\-0) is returned.
-.P
-If
-.I x
-is positive infinity, positive infinity is returned.
-.P
-If
-.I x
-is negative infinity, \-1 is returned.
-.P
-If the result overflows, a range error occurs,
-and the functions return
-.RB \- HUGE_VAL ,
-.RB \- HUGE_VALF ,
-or
-.RB \- HUGE_VALL ,
-respectively.
-.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
-Range error, overflow
-.I errno
-is set to
-.B ERANGE
-(but see BUGS).
-An overflow floating-point exception
-.RB ( FE_OVERFLOW )
-is raised.
-.\"
-.\" POSIX.1 specifies an optional range error (underflow) if
-.\" x is subnormal. glibc does not implement this.
-.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 expm1 (),
-.BR expm1f (),
-.BR expm1l ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-BSD.
-.SH BUGS
-Before glibc 2.17,
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6778
-on certain architectures (e.g., x86, but not x86_64)
-.BR expm1 ()
-raised a bogus underflow floating-point exception
-for some large negative
-.I x
-values (where the function result approaches \-1).
-.P
-Before approximately glibc 2.11,
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6814
-.\" e.g., expm1(1e5) through expm1(1.00199970127e5),
-.\" but not expm1(1.00199970128e5) and beyond.
-.BR expm1 ()
-raised a bogus invalid floating-point exception in addition to the expected
-overflow exception, and returned a NaN instead of positive infinity,
-for some large positive
-.I x
-values.
-.P
-Before glibc 2.11,
-.\" It looks like the fix was in glibc 2.11, or possibly glibc 2.12.
-.\" I have no test system for glibc 2.11, but glibc 2.12 passes.
-.\" From the source (sysdeps/i386/fpu/s_expm1.S) it looks
-.\" like the changes were in glibc 2.11.
-the glibc implementation did not set
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6788
-.I errno
-to
-.B ERANGE
-when a range error occurred.
-.SH SEE ALSO
-.BR exp (3),
-.BR log (3),
-.BR log1p (3)