Name
erfc, erfcf, erfcl — complementary error function
Synopsis
#include <math.h>
double
erfc( |
double x); |
float
erfcf( |
float x); |
long double
erfcl( |
long double x); |
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RETURN VALUE
On success, these functions return the complementary error
function of x, a
value in the range [0,2].
If x is a NaN, a
NaN is returned.
If x is +0 or
−0, 1 is returned.
If x is positive
infinity, +0 is returned.
If x is negative
infinity, +2 is returned.
If the function result underflows and produces an unrepresentable value, the return value is 0.0.
If the function result underflows but produces a representable (i.e., subnormal) value, that value is returned, and a range error occurs.
ERRORS
See 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: result underflow(result is subnormal)-
An underflow floating-point exception (
FE_UNDERFLOW) is raised.
These functions do not set errno.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
erfc(), erfcf(), erfcl() |
Thread safety | MT-Safe |
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD.
NOTES
The erfc(), erfcf(), and erfcl() functions are provided to avoid the
loss accuracy that would occur for the calculation 1-erf(x)
for large values of x
(for which the value of erf(x) approaches 1).
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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