chi2invtable.m

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%CHI2INVTABLE Lookup table of the inverse of the chi-square cdf.
%   X = CHI2INVTABLE(P,V) returns the inverse of the chi-square cumu-
%   lative distribution function (cdf) with V degrees of freedom at
%   the value P. The chi-square cdf with V degrees of freedom, is 
%   the gamma cdf with parameters V/2 and 2.   
%
%   Opposed to CHI2INV of the Matlab statistics toolbox which might
%   be not part of your Matlab installation, this is a lookup table
%   which has the side effect of being much faster than CHI2INV.
%   However, as any lookup table is a collection of sample points,
%   accuracy is smaller and between the sample points of the cdf, a
%   linear interpolation is made.