X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fm%2Fstatistics%2Fbase%2Fstatistics.m;fp=octave_packages%2Fm%2Fstatistics%2Fbase%2Fstatistics.m;h=637135b6f191cbba54d70b25c90830983742e5e6;hp=0000000000000000000000000000000000000000;hb=1c0469ada9531828709108a4882a751d2816994a;hpb=63de9f36673d49121015e3695f2c336ea92bc278 diff --git a/octave_packages/m/statistics/base/statistics.m b/octave_packages/m/statistics/base/statistics.m new file mode 100644 index 0000000..637135b --- /dev/null +++ b/octave_packages/m/statistics/base/statistics.m @@ -0,0 +1,89 @@ +## Copyright (C) 1995-2012 Kurt Hornik +## +## This file is part of Octave. +## +## Octave 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. +## +## Octave 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 Octave; see the file COPYING. If not, see +## . + +## -*- texinfo -*- +## @deftypefn {Function File} {} statistics (@var{x}) +## @deftypefnx {Function File} {} statistics (@var{x}, @var{dim}) +## Return a vector with the minimum, first quartile, median, third quartile, +## maximum, mean, standard deviation, skewness, and kurtosis of the elements of +## the vector @var{x}. +## +## If @var{x} is a matrix, calculate statistics over the first +## non-singleton dimension. +## If the optional argument @var{dim} is given, operate along this dimension. +## @seealso{min, max, median, mean, std, skewness, kurtosis} +## @end deftypefn + +## Author: KH +## Description: Compute basic statistics + +function stats = statistics (x, dim) + + if (nargin != 1 && nargin != 2) + print_usage (); + endif + + if (! (isnumeric (x) || islogical (x))) + error ("statistics: X must be a numeric vector or matrix"); + endif + + nd = ndims (x); + sz = size (x); + if (nargin != 2) + ## Find the first non-singleton dimension. + (dim = find (sz > 1, 1)) || (dim = 1); + else + if (!(isscalar (dim) && dim == fix (dim)) + || !(1 <= dim && dim <= nd)) + error ("statistics: DIM must be an integer and a valid dimension"); + endif + endif + + if (sz(dim) < 2) + error ("statistics: dimension of X is too small (<2)"); + endif + + emp_inv = quantile (x, [0.25; 0.5; 0.75], dim, 7); + + stats = cat (dim, min (x, [], dim), emp_inv, max (x, [], dim), mean (x, dim), + std (x, [], dim), skewness (x, dim), kurtosis (x, dim)); + +endfunction + + +%!test +%! x = rand (7,5); +%! s = statistics (x); +%! assert (min (x), s(1,:), eps); +%! assert (median (x), s(3,:), eps); +%! assert (max (x), s(5,:), eps); +%! assert (mean (x), s(6,:), eps); +%! assert (std (x), s(7,:), eps); +%! assert (skewness (x), s(8,:), eps); +%! assert (kurtosis (x), s(9,:), eps); + +%% Test input validation +%!error statistics () +%!error statistics (1, 2, 3) +%!error statistics (['A'; 'B']) +%!error statistics (1, ones(2,2)) +%!error statistics (1, 1.5) +%!error statistics (1, 0) +%!error statistics (1, 3) +%!error statistics (1) +