EXPM1(3) Linux Programmer's Manual EXPM1(3)[top]NAMEexpm1, expm1f,expm1l- exponential minus 1SYNOPSIS#include <math.h> double expm1(double x); float expm1f(float x); long double expm1l(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): expm1(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99 expm1f(), expm1l(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99-lm.DESCRIPTIONexpm1(x) returns a value equivalent to exp(x) - 1 It is computed in a way that is accurate even if the value of x is near zero—a case where exp(x) - 1 would be inaccurate due to subtraction of two numbers that are nearly equal.RETURN VALUEOn success, these functions return exp(x) - 1. If x is a NaN, a NaN is returned. If x is +0 (-0), +0 (-0) is returned. If x is positive infinity, positive infinity is returned. If x is negative infinity,is returned. If the result overflows, a range error occurs, and the functions return-1,-HUGE_VAL, or-HUGE_VALF, respectively.-HUGE_VALLERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Range error, overflow An overflow floating-point exception (FE_OVERFLOW) is raised. These functions do not set errno.CONFORMING TOC99, POSIX.1-2001.BUGSFor some large negative x values (where the function result approaches -1), expm1() raises a bogus underflow floating-point exception. For some large positive x values, expm1() raises a bogus invalid float‐ ing-point exception in addition to the expected overflow exception, and returns a NaN instead of positive infinity.SEE ALSOexp(3), log(3), log1p(3)COLOPHONThis page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-08-05 EXPM1(3)

List of man pages available for

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]

Polar

Member of Polar

Based on Fawad Halim's script.

....................................................................

Vote for polarhome |