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1 ## Copyright (C) 1996, 1997 A. S. Hodel <scotte@eng.auburn.edu> |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} is_duplicate_entry (@var{x}) |
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22 ## Return non-zero if any entries in @var{x} are duplicates of one |
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23 ## another. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: A. S. Hodel <scotte@eng.auburn.edu> |
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27 |
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28 function retval = is_duplicate_entry (x) |
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29 |
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30 if (nargin == 1) |
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31 if (ismatrix (x)) |
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32 [m, n] = size (x); |
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33 lx = m*n; |
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34 lx1 = lx-1; |
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35 x = sort (reshape (x, 1, lx)); |
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36 dx = x(1:lx1) - x(2:lx); |
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37 retval = sum (dx == 0); |
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38 else |
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39 error ("is_duplicate_entry: expecting matrix argument"); |
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40 endif |
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41 else |
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42 usage ("is_duplicate_entry (x)"); |
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43 endif |
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44 |
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45 endfunction |
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46 |
