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1 ## Copyright (C) 2000 Kai Habel |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} @var{r}= corr2 (@var{I},@var{J}) |
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19 ## returns the correlation coefficient between @var{I} and @var{j}. |
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20 ## @var{I,J} must be real type matrices or vectors of same size |
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21 ## @end deftypefn |
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22 |
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23 |
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24 ## Author: Kai Habel <kai.habel@gmx.de> |
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25 ## Date: 01/08/2000 |
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26 |
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27 function r = corr2 (I, J) |
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28 |
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29 if !(nargin == 2) |
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30 usage ("corr2(I,J)"); |
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31 endif |
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32 |
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33 if !(is_matrix(I) && isreal(I) && is_matrix(J) && isreal(J)) |
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34 error("argument must be a real type matrix"); |
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35 endif |
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36 |
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37 if (size (I) != size (J)) |
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38 error("arguments must be of same size") |
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39 endif |
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40 |
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41 r = cov (I, J) / (std2(I)*std2(J)); |
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42 endfunction |
