On Mon, Sep 8, 2008 at 19:22, Devon McCormick <[EMAIL PROTECTED]> wrote: > We haven't ended quite yet. Perhaps you remember the article by Ewart Shaw > in Vector 18.4, in which he defined the error function erf using J's > hypergeometric conjunction: > > erf =: (*&(%:4p_1)%^@:*:)*[:1 H. 1.5*: NB. A&S 7.1.21 (right) > > and then defined the cumulative distribution function of the normal > distribution by: > > cnd =: [:-:1:+[:erf%&(%:2) NB. A&S 26.2.29 (solved for P) > )
I don't know know what the original source is, but it's such a nice phrase that a variant of it even in the Dictionary entry for the H. primitive. Ambrus ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
