erf man page on DigitalUNIX

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erf(3)									erf(3)

       erf, erfc - Error functions

       #include <math.h>

       double erf(
	       double x ); float erff(
	       float x ); long double erfl(
	       long double x ); double erfc(
	       double x ); float erfcf(
	       float x ); long double erfcl(
	       long double x );

       Math Library (libm)

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       erf():  XPG4

       erfc():	XPG4

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

       The erf(), erff(), and erfl() functions return the error function of x,
       where erf(x), erff(x), and erfl(x) equal (2/sqrt(pi))  times  the  area
       under the curve e**(-t**2) between 0 and x.

       The  erfc(), erfcf(),  and erfcl() functions return (1.0 - erf(x)). The
       erfc() function can result in an underflow as x gets large.


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