+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−%
+
−% Compute Chi square cumulative distribution function
+
−% 
+
−% CALL 
+
−% 
+
−% p = Chi2cdf(x,v);
+
−% 
+
−% 
+
−% INPUT
+
−% 
+
−% - x, data
+
−% - v, degrees of freedom of the distribution
+
−% 
+
−%   References:
+
−%      [1]  M. Abramowitz and I. A. Stegun, "Handbook of Mathematical
+
−%      Functions", Government Printing Office, 1964, 26.4.
+
−% 
+
−%
+
−% L Ferraioli 14-02-2011
+
−%
+
−% $Id: Chi2cdf.m,v 1.2 2011/05/30 17:18:09 luigi Exp $
+
−%
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−function p = Chi2cdf(x,v)
+
−
+
−% Call the gamma distribution function. 
+
−p = gammainc(x./2,v/2);
+
−
+
−
+
−end