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annotate scripts/general/shift.m @ 3263:7d80b56e0dc8

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[project @ 1999-08-20 19:10:09 by jwe]
author jwe
date Fri, 20 Aug 1999 19:12:29 +0000
parents 041ea33fbbf4
children f37ca3017116
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1 ## Copyright (C) 1995, 1996 Kurt Hornik
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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, or (at your option)
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6 ## 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, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## 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 file. If not, write to the Free Software Foundation,
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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16
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17 ## usage: y = shift (x, b)
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18 ##
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19 ## If x is a vector, perform a circular shift of length b of the
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20 ## elements of x.
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21 ##
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22 ## If x is a matrix, do the same for each column of x.
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23
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24 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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25 ## Created: 14 September 1994
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26 ## Adapted-By: jwe
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27
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28 function y = shift (x, b)
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29
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30 if (nargin != 2)
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31 error ("usage: shift (X, b)");
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32 endif
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33
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34 [nr, nc] = size (x);
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35
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36 if (nr == 0 || nc == 0)
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37 error ("shift: x must not be empty");
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38 elseif (nr == 1)
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39 x = x.';
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40 nr = nc;
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41 nc = 0;
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42 endif
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43
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44 if (! (is_scalar (b) && b == round (b)))
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45 error ("shift: b must be an integer");
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46 endif
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47
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48 if (b >= 0)
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49 b = rem (b, nr);
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50 t1 = x (nr-b+1:nr, :);
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51 t2 = x (1:nr-b, :);
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52 y = [t1; t2];
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53 elseif (b < 0)
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54 b = rem (abs (b), nr);
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55 t1 = x (b+1:nr, :);
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56 t2 = x (1:b, :);
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57 y = [t1; t2];
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58 endif
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59
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60 if (nc == 0)
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61 y = reshape (y, 1, nr);
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62 endif
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63
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64 endfunction