/usr/share/octave/packages/3.2/nan-2.4.4/tpdf.m is in octave-nan 2.4.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | function p = tpdf(x,n)
% TPDF returns student probability density
%
% pdf = tpdf(x,DF);
%
% Computes the PDF of a the student distribution
% with DF degreas of freedom
% x,DF must be matrices of same size, or any one can be a scalar.
%
% see also: TINV, TCDF, NORMPDF, NORMCDF, NORMINV
% Reference(s):
% $Id: tpdf.m 8223 2011-04-20 09:16:06Z schloegl $
% Copyright (C) 2000-2003,2008,2009,2010 by Alois Schloegl <alois.schloegl@gmail.com>
% This function is part of the NaN-toolbox
% http://pub.ist.ac.at/~schloegl/matlab/NaN/
% 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/>.
% allocate memory and check size of arguments
p = x+n; % if this line causes an error, size of input arguments do not fit.
ix = (n>0) & (n~=inf) & ~isnan(x);
% make size of x and n equal
n = x+n-x;
x = x+n-n;
% workaround for invalid arguments in BETA
if any(ix)
p(ix) = (exp (-(n(ix)+1).*log(1+x(ix).^2./n(ix))/2) ./ (sqrt(n(ix)).* beta(n(ix)/2, 1/2)));
end;
p(~ix)= NaN;
% shape output
p = reshape(p,size(x));
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