Searched defs:erf (Results 1 - 1 of 1) sorted by relevance

/ast/src/lib/libast/uwin/
H A Derf.c39 static char sccsid[] = "@(#)erf.c 8.1 (Berkeley) 6/4/93";
58 /* double erf(double x)
62 * erf(x) = --------- | exp(-t*t)dt
66 * erfc(x) = 1-erf(x)
69 * 1. Reduce x to |x| by erf(-x) = -erf(x)
71 * erf(x) = x + x*P(x^2)
72 * erfc(x) = 1 - erf(x) if x<=0.25
77 * is an approximation to (erf(x)-x)/x with precision
80 * | P - (erf(
269 extern double erf(x) function
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