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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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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 3 of the License, or (at |
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8 ## your option) 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, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} postpad (@var{x}, @var{l}, @var{c}) |
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21 ## See prepad. |
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22 ## @end deftypefn |
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23 |
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24 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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25 ## Created: June 1994 |
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26 |
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27 function y = postpad (x, l, c, dim) |
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28 |
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29 if (nargin < 2 || nargin > 4) |
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30 print_usage (); |
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31 endif |
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32 |
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33 if (nargin < 3 || isempty (c)) |
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34 c = 0; |
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35 else |
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36 if (! isscalar (c)) |
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37 error ("postpad: third argument must be empty or a scalar"); |
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38 endif |
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39 endif |
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40 |
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41 nd = ndims (x); |
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42 sz = size (x); |
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43 if (nargin < 4) |
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44 %% Find the first non-singleton dimension |
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45 dim = 1; |
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46 while (dim < nd + 1 && sz (dim) == 1) |
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47 dim = dim + 1; |
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48 endwhile |
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49 if (dim > nd) |
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50 dim = 1; |
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51 endif |
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52 else |
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53 if (! (isscalar (dim) && dim == round (dim)) && dim > 0 && |
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54 dim < (nd + 1)) |
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55 error ("postpad: dim must be an integer and valid dimension"); |
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56 endif |
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57 endif |
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58 |
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59 if (! isscalar (l) || l < 0) |
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60 error ("second argument must be a positive scaler"); |
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61 endif |
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62 |
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63 if (dim > nd) |
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64 sz(nd+1:dim) = 1; |
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65 endif |
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66 |
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67 d = sz (dim); |
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68 |
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69 if (d >= l) |
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70 idx = cell (); |
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71 for i = 1:nd |
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72 idx {i} = 1:sz(i); |
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73 endfor |
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74 idx {dim} = 1:l; |
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75 y = x (idx {:}); |
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76 else |
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77 sz (dim) = l - d; |
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78 y = cat (dim, x, c * ones (sz)); |
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79 endif |
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80 |
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81 endfunction |
