mctad.inverseErf = function (x) {
var a = 0.147;
return mctad.sign(x) * Math.sqrt(
Math.sqrt(
Math.pow((2 / (mctad.π * a) + (Math.log(1 - Math.pow(x, 2)) / 2)), 2) - Math.log(1 - Math.pow(x, 2)) / a
) - ((2 / (mctad.π * a)) + Math.log(1 - Math.pow(x, 2)) / 2)
);
};
Inverse Error Function
The Inverse Error Function.
This approximation uses the value of
aas 0.147 to reduce the maximum error to about 0.00012 as per Winitzki, Sergei (6 February 2008). "A handy approximation for the error function and its inverse".TODO: