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Complementary error function
#include <math.h>
double erfc ( double x );
float erfcf ( float x );
- x
- The number for which you want to compute the complementary error function.
libm
Use the -l m option to
qcc
to link against this library.
The erfc() and erfcf() functions calculate the
complementary error function of x
(i.e. the result of the error function,
erf(),
subtracted from 1.0).
This is useful because the error function isn't very accurate
when x is large.
The erf() function computes:
This equality is true: erfc(-x) = 2 - erfc(x)
The value of the error function, or NAN
if x is NAN.
|
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
errno
to 0, call the function, and then check errno again.
These functions don't change errno if no errors occurred. |
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
erf()
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