erfc

erfc

Compute the Complementary Error Function

Portability: UNIX compatible

SYNOPSIS
DESCRIPTION
RETURN VALUE
DIAGNOSTICS
EXAMPLE
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

#include <lcmath.h>

double erfc(double x);

DESCRIPTION

erfc computes the complementary error function of its argument x . The value returned by erfc is defined by this equation:

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Note the following:

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RETURN VALUE

erfc returns the complementary error function of its argument.

DIAGNOSTICS

An error message is written to the standard error file ( stderr ) by the run-time library if x exceeds the value 13.30619656013802. In this case, the function returns 0.0.

If an error occurs in erfc , the _matherr routine is called. You can supply your own version of _matherr to suppress the diagnostic message or modify the value returned.

EXAMPLE

This example computes the complementary error function using erfc :

#include <stdio.h>
#include <lcmath.h>

#define SVECTOR .7854

main()
{
   double erfcv;
   erfcv = erfc(SVECTOR);
   printf("erfc(%f) = %f\n", SVECTOR, erfcv);
}

RELATED FUNCTIONS

erf , _matherr

SEE ALSO

Mathematical Functions

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