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#include <math.h>
double erf (double x); float erff (float x); double erfc (double x); float erfcf (float x);
Interfaces documented on this reference page conform to industry standards as follows:
erf(): XPG4
erfc(): XPG4
Refer to the standards(5) reference page for more information about industry standards and associated tags.
The erf() and erff() functions return the error function of x, where erf(x) and erff(x) equal (2/sqrt(pi)) times the area under the curve e**(-t**2) between 0 and x.
The erfc() and erfcf() functions return (1.0 - erf(x)). The erfc() function can result in an underflow as x gets large.
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