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/bionic/libm/src/
H A Ds_erf.c17 /* double erf(double x)
21 * erf(x) = --------- | exp(-t*t)dt
25 * erfc(x) = 1-erf(x)
27 * erf(-x) = -erf(x)
32 * erf(x) = x + x*R(x^2)
33 * erfc(x) = 1 - erf(x) if x in [-.84375,0.25]
38 * | R - (erf(x)-x)/x | <= 2
42 * erf(x) = (2/sqrt(pi))*(x - x^3/3 + x^5/10 - x^7/42 + ....)
46 * point of erf(
191 erf(double x) function
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