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ERFC
Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index
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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);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
erfc():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
erfcf(),
erfcl():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600|| _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
erfc()
function returns the complementary error function of
x,
that is, 1.0 - erf(x).
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.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
NOTES
The
erfc()
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).
SEE ALSO
cerf(3),
erf(3),
exp(3)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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