For certain special arguments erf automatically evaluates to exact values.
Error function mathematica.
299 where is a confluent hypergeometric function of the first kind and is a gamma function.
0 i for large arguments.
Note that some authors e g whittaker and watson 1990 p.
Erf z 0 z 1 is given by.
Abramowitz and stegun 1972 p.
Erf satisfies the identities.
Mathematical function suitable for both symbolic and numerical manipulation.
The first few values extended by the definition for and 0 are given by.
I tried playing with setsystemoptions catchmachineunderflow false which however results in getting 0.
Revolutionary knowledge based programming language.
Then i tried defining the function as exp log z 2 log erfc i z but this turns out to not be any faster than with automatic switching so it seems hard to speed this up except as daniel lichtblau suggests acl jul 24 11 at 23 46.
Revolutionary knowledge based programming language.
341 define without the leading factor of.
The preeminent environment for any technical workflows.
Erf z is the integral of the gaussian distribution given by.