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