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erf |
(function for equations) |
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Usage: |
erf (x) |
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Definition: |
(2 / sqrt(p)) Integral from 0 to x of exp (-t^2) dt |
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Required: |
x is an unrestricted real |
This returns the error function of x. It is useful for calculating integrals of the normal distribution.
If x is large, you can obtain better accuracy with erfc.