mathjs/docs/reference/functions/erf.md

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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 ( https://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

Throws #

Type	Description

Examples #

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

See also #

zeta