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1 ## Copyright (C) 1995, 1996, 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008 |
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2 ## Kurt Hornik |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} vec (@var{x}) |
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22 ## Return the vector obtained by stacking the columns of the matrix @var{x} |
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23 ## one above the other. |
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24 ## @end deftypefn |
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25 |
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26 ## See Magnus and Neudecker (1988), Matrix differential calculus with |
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27 ## applications in statistics and econometrics. |
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28 |
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29 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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30 ## Created: 8 May 1995 |
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31 ## Adapted-By: jwe |
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32 |
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33 function v = vec (x) |
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34 |
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35 if (nargin != 1) |
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36 print_usage (); |
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37 endif |
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38 |
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39 v = x(:); |
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40 |
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41 endfunction |
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42 |
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43 %!assert(vec ([1, 2; 3, 4]) == [1; 3; 2; 4] && vec ([1, 3, 2, 4]) == [1; 3; 2; 4]); |
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44 |
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45 %!error vec (); |
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46 |
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47 %!error vec (1, 2); |
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48 |
