/usr/share/octave/packages/nan-2.5.9/norminv.m is in octave-nan 2.5.9-1build1.
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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 | function x = norminv(p,m,s)
% NORMINV returns inverse cumulative function of the normal distribution
%
% x = norminv(p,m,s);
%
% Computes the quantile (inverse of the CDF) of a the normal
% cumulative distribution with mean m and standard deviation s
% default: m=0; s=1;
% p,m,s must be matrices of same size, or any one can be a scalar.
%
% see also: NORMPDF, NORMCDF
% Reference(s):
% $Id: norminv.m 9033 2011-11-08 20:58:07Z schloegl $
% Copyright (C) 2000-2003,2010,2011 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/>.
if nargin==1,
m=0; s=1;
elseif nargin==2,
s=1;
end;
% allocate output memory and check size of arguments
x = sqrt(2)*erfinv(2*p - 1).*s + m; % if this line causes an error, input arguments do not fit.
x((p>1) | (p<0) | isnan(p) | isnan(m) | isnan(s) | (s<0)) = nan;
k = (s==0) & ~isnan(m); % temporary variable, reduces number of tests.
x((p==0) & k) = -inf;
x((p==1) & k) = +inf;
k = (p>0) & (p<1) & k;
if numel(m)==1,
x(k) = m;
else
x(k) = m(k);
end;
%!assert(sum(~isnan(norminv([-inf,-.2,0,.2,.5,1,2,inf,nan],2,0))),4)
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