/usr/share/octave/packages/3.2/nan-2.4.4/tcdf.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 48 49 50 51 52 53 54 55 56 57 58 59 | 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, TPDF, TINV
% Reference(s):
% $Id: tcdf.m 8223 2011-04-20 09:16:06Z schloegl $
% Copyright (C) 2000-2003,2009 by Alois Schloegl <alois.schloegl@gmail.com>
% This is part of the NaN-toolbox. For more details see
% 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 3 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
if all(size(x)==1)
x = repmat(x,size(n));
elseif all(size(n)==1)
n = repmat(n,size(x));
elseif all(size(x)==size(n))
; %% OK, do nothing
else
error('size of input arguments must be equal or scalar')
end;
% allocate memory
p = zeros(size(x));
p((x==Inf) & (n>0)) = 1;
% workaround for invalid arguments in BETAINC
ix = isnan(x) | ~(n>0);
p(ix)= NaN;
ix = (x > -Inf) & (x < Inf) & (n > 0);
p(ix) = betainc (n(ix) ./ (n(ix) + x(ix).^2), n(ix)/2, 1/2) / 2;
ix = find(x>0);
p(ix) = 1 - p(ix);
% shape output
p = reshape(p,size(x));
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