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1 ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2004, 2005, 2007 |
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2 ## John W. Eaton |
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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} {} sinc (@var{x}) |
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22 ## Return |
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23 ## @iftex |
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24 ## @tex |
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25 ## $ \sin (\pi x)/(\pi x)$. |
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26 ## @end tex |
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27 ## @end iftex |
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28 ## @ifinfo |
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29 ## sin(pi*x)/(pi*x). |
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30 ## @end ifinfo |
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31 ## @end deftypefn |
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32 |
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33 ## Author: jwe ??? |
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34 |
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35 function result = sinc (x) |
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36 |
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37 if (nargin != 1) |
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38 print_usage (); |
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39 endif |
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40 |
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41 result = ones (size (x)); |
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42 |
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43 i = (x != 0); |
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44 |
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45 if (any (i(:))) |
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46 t = pi * x(i); |
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47 result(i) = sin (t) ./ t; |
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48 endif |
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49 |
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50 endfunction |
