/usr/share/octave/packages/3.2/statistics-1.0.10/zscore.m is in octave-statistics 1.0.10-1.
This file is owned by root:root, with mode 0o644.
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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 | ## Copyright (C) 2001 Paul Kienzle
##
## 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/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{A} =} zscore (@var{X})
## Compute the @math{z}-score.
##
## Compute the @math{z}-score of each element of @var{X} relative to the data in
## the columns of @var{X}. The @math{z}-score for a single data point @math{x_i}
## is:
##
## @example
## (x_i - mean(x))/std(x)
## @end example
## @end deftypefn
function [A, mu, sigma] = zscore(X,varargin)
if (nargin != 1 && nargin != 2)
usage("zscore(X,dim)");
endif
if (nargin == 2)
dim = varargin{1}
else
dim = min(find(size(X)>1));
if isempty(dim), dim=1; endif;
endif
sz = ones(1,length(size(X)));
sz(dim) = size(X,dim);
A = (X - repmat(mean(X,varargin{:}),sz)) ./ repmat(std(X,varargin{:}),sz);
if (nargout > 1)
mu = mean (X, dim);
endif
if (nargout > 2)
sigma = std (X, 0, dim);
endif
endfunction
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