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Class: none
Declaration: function ErfApprox (x: double): double;

Calculating the error function by using the incomplete gamma function requires considerable time. If performance is an issue you may consider to use a Chebyshev approximation which is accurate to approx. 10-7. The function ErfApprox returns the approximated error function.

Hint: The complementary error function (often denoted as erfc) can be easily calculated from Erf: erfc(x) = 1-Erf(x).

Last Update: 2012-Oct-20