Re: [ROOT] normal plots, box plots with root?

From: Andre Holzner (Andre.Holzner@cern.ch)
Date: Wed Feb 28 2001 - 09:48:49 MET


Hi,


Isard_Dunietz wrote:

> 2)  It also would be useful to calculate
>     the inverse
>     cummulative density function (c.d.f.), i.e.
>     the inverse fnct of
>                 cdf( z ) = ( 1 + TMath::Erf( z / TMath::Sqrt(2) ) )
>     Is such a fnct easily obtainable inside root?

I once was looking for such a function, I didn't find it in ROOT.
So I 'borrowed' inverse_normal_func(double p) and
inverse_error_func(double x)
from gnuplot's specfun.c.

Looking at the copyright at the top of the file, it is not
clear to me whether this could be included 1:1 into root..

Also, these functions seem to have their own copyright (the original
fortran code called MDNRIS and seems to be from Netlib (www.netlib.org)
--
however, I couldn't find it now) and one is only allowed to use 
them for non-commercial purposes...



best regards,

André
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