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annotate scripts/polynomial/ppder.m @ 12541:dd2c70b30f28

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Add tests for ifftshift.m
author Robert T. Short <octave@phaselockedsystems.com.com>
date Sat, 26 Mar 2011 06:50:12 -0700
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1 ## Copyright (C) 2008-2011 VZLU Prague, a.s., Czech Republic
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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
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6 ## it 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
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8 ## (at your option) any later version.
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9 ##
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10 ## This program is distributed in the hope that it will be useful,
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11 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ## GNU 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 this software; 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} {@var{ppd} =} ppder (@var{pp})
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21 ## Compute the piecewise derivative of the piecewise polynomial struct @var{pp}.
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22 ## @seealso{mkpp,ppval,ppint}
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23 ## @end deftypefn
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24
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25 function ppd = ppder (pp)
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26 if (nargin != 1)
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27 print_usage ();
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28 endif
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29 if (! isstruct (pp))
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30 error ("ppder: PP must be a structure");
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31 endif
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32
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33 [x, p, n, k, d] = unmkpp (pp);
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34 p = reshape (p, [], k);
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35 if (k <= 1)
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36 pd = zeros (rows (p), 1);
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37 k = 1;
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38 else
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39 k -= 1;
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40 pd = p(:,1:k) * diag (k:-1:1);
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41 endif
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42 ppd = mkpp (x, pd, d);
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43 endfunction
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44