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    Searched defs:erf (Results 1 - 3 of 3) sorted by relevancy

  /src/lib/libm/src/
s_erf.c 18 /* double erf(double x)
22 * erf(x) = --------- | exp(-t*t)dt
26 * erfc(x) = 1-erf(x)
28 * erf(-x) = -erf(x)
33 * erf(x) = x + x*R(x^2)
34 * erfc(x) = 1 - erf(x) if x in [-.84375,0.25]
39 * | R - (erf(x)-x)/x | <= 2
43 * erf(x) = (2/sqrt(pi))*(x - x^3/3 + x^5/10 - x^7/42 + ....)
47 * point of erf(x) is near 0.6174 (i.e., erf(x)=x when x i
192 erf(double x) function in typeref:typename:double
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  /src/include/
tgmath.h 153 #define erf(a) __TG_FN1(erf, (a)) macro
  /src/lib/libm/noieee_src/
n_erf.c 33 static char sccsid[] = "@(#)erf.c 8.1 (Berkeley) 6/4/93";
55 /* double erf(double x)
59 * erf(x) = --------- | exp(-t*t)dt
63 * erfc(x) = 1-erf(x)
66 * 1. Reduce x to |x| by erf(-x) = -erf(x)
68 * erf(x) = x + x*P(x^2)
69 * erfc(x) = 1 - erf(x) if x<=0.25
74 * is an approximation to (erf(x)-x)/x with precision
77 * | P - (erf(x)-x)/x | <=
266 erf(double x) function in typeref:typename:double
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