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1 ## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2007 |
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2 ## Auburn University. All rights reserved. |
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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} {} freqchkw (@var{w}) |
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22 ## Used by @command{__freqresp__} to check that input frequency vector @var{w} |
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23 ## is valid. |
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24 ## Returns boolean value. |
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25 ## @end deftypefn |
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26 |
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27 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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28 ## Created: July 1996 |
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29 |
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30 function USEW = freqchkw (w) |
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31 |
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32 if (nargin != 1) |
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33 print_usage (); |
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34 endif |
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35 |
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36 if (isempty (w)) |
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37 USEW = 0; |
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38 elseif (! isvector (w)) |
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39 error ("w (%dx%d): must be [], a vector or a scalar", |
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40 rows (w), columns (w)); |
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41 elseif (max (abs (imag(w))) != 0 && min (real (w)) <= 0) |
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42 error ("w must have real positive entries"); |
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43 else |
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44 w = sort (w); |
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45 USEW = 1; ## vector provided (check values later) |
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46 endif |
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47 |
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48 endfunction |
