function p = tcdf(x,n); % TCDF returns student cumulative distribtion function % % cdf = tcdf(x,DF); % % Computes the CDF of the students distribution % with DF degrees of freedom % x,DF must be matrices of same size, or any one can be a scalar. % % see also: NORMCDF, NORMPDF, NORMINV % Reference(s): % $Revision: 4585 $ % $Id: tcdf.m 4585 2008-02-04 13:47:45Z adb014 $ % Copyright (C) 2000-2003 by Alois Schloegl <a.schloegl@ieee.org> % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU General Public License as published by % the Free Software Foundation; either version 2 of the License, or % (at your option) any later version. % % This program is distributed in the hope that it will be useful, % but WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the % GNU General Public License for more details. % % You should have received a copy of the GNU General Public License % along with this program; If not, see <http://www.gnu.org/licenses/>. % check size of arguments n = x+n-x; % if this line causes an error, size of input arguments do not fit. z = n ./ (n + x.^2); % allocate memory p = z; p(x==Inf) = 1; % workaround for invalid arguments in BETAINC tmp = isnan(z) | ~(n>0); p(tmp)= NaN; ix = (~tmp); p(ix) = betainc (z(ix), n(ix)/2, 1/2) / 2; ix = find(x>0); p(ix) = 1 - p(ix); % shape output p = reshape(p,size(z));

Generated by Doxygen 1.6.0 Back to index