ERFC(3M) Mathematical Library Functions ERFC(3M)
erfc, erfcf, erfcl - complementary error function
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double erfc(double x);
float erfcf(float x);
long double erfcl(long double x);
These function compute the complementary error function 1.0 - erf(x).
Upon successful completion, these functions return the value of the
complementary error function.
If x is NaN, a NaN is returned.
If x is +-0, +1 is returned.
If x is -Inf, +2 is returned.
If x is +Inf, 0 is returned.
No errors are defined.
The erfc() function is provided because of the extreme loss of
relative accuracy if erf(x) is called for large x and the result
subtracted from 1.0.
See attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
math.h(3HEAD), erf(3M), isnan(3M), attributes(7), standards(7)
SunOS 5.11 July 12, 2006 ERFC(3M)
NAME
erfc, erfcf, erfcl - complementary error function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double erfc(double x);
float erfcf(float x);
long double erfcl(long double x);
DESCRIPTION
These function compute the complementary error function 1.0 - erf(x).
RETURN VALUES
Upon successful completion, these functions return the value of the
complementary error function.
If x is NaN, a NaN is returned.
If x is +-0, +1 is returned.
If x is -Inf, +2 is returned.
If x is +Inf, 0 is returned.
ERRORS
No errors are defined.
USAGE
The erfc() function is provided because of the extreme loss of
relative accuracy if erf(x) is called for large x and the result
subtracted from 1.0.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
SEE ALSO
math.h(3HEAD), erf(3M), isnan(3M), attributes(7), standards(7)
SunOS 5.11 July 12, 2006 ERFC(3M)