erfce

Evaluates the exponentially scaled complementary error function.

Synopsis

#include <imsl.h>

float imsl_f_erfce (float x)

The type double function is imsl_d_erfce.

Required Arguments

float x (Input)
Argument for which the function value is desired.

Return Value

Exponentially scaled complementary error function value.

Description

Function imsl_f_erfce computes

 

where erfc(x) is the complementary error function. See imsl_f_erfc for its definition.

To prevent the answer from underflowing, x must be greater than

 

where b = imsl_f_machine(2) is the largest representable floating-point number. For more information, see the description for imsl_f_machine.

Example

In this example, imsl_f_erfce(1.0) is computed and printed.

 

#include <imsl.h>

#include <stdio.h>

 

int main()

{

float value, x;

 

x = 1.0;

value = imsl_f_erfce(x);

printf("erfce(%6.3f) = %6.3f \n", x, value);

}

Output

 

erfce( 1.000) = 0.428