Function erf #

Compute the erf function of a value using a rational Chebyshev approximations for different intervals of x.

This is a translation of W. J. Cody’s Fortran implementation from 1987 ( http://www.netlib.org/specfun/erf ). See the AMS publication “Rational Chebyshev Approximations for the Error Function” by W. J. Cody for an explanation of this process.

For matrices, the function is evaluated element wise.

Syntax #

math.erf(x)

Parameters #

Parameter Type Description
x number | Array | Matrix A real number

Returns #

Type Description
number | Array | Matrix The erf of x

Examples #

math.erf(0.2);    // returns 0.22270258921047847
math.erf(-0.5);   // returns -0.5204998778130465
math.erf(4);      // returns 0.9999999845827421
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