Mercurial > hg > octave-nkf
annotate scripts/signal/spectral_adf.m @ 17338:1c89599167a6
maint: End m-files with 1 blank line.
Simplifies automated grammarchecking script.
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scripts/ui/private/message_dialog.m: End m-files with 1 blank line.
| author | Rik <rik@octave.org> |
|---|---|
| date | Wed, 28 Aug 2013 08:33:02 -0700 |
| parents | bc924baa2c4e |
| children | d63878346099 |
| rev | line source |
|---|---|
|
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1 ## Copyright (C) 1995-2012 Friedrich Leisch |
| 3426 | 2 ## |
| 3922 | 3 ## This file is part of Octave. |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 3426 | 9 ## |
| 3922 | 10 ## Octave is distributed in the hope that it will be useful, but |
| 3191 | 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3426 | 13 ## General Public License for more details. |
| 14 ## | |
| 3191 | 15 ## You should have received a copy of the GNU General Public License |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 3191 | 18 |
| 3449 | 19 ## -*- texinfo -*- |
|
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20 ## @deftypefn {Function File} {} spectral_adf (@var{c}) |
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21 ## @deftypefnx {Function File} {} spectral_adf (@var{c}, @var{win}) |
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22 ## @deftypefnx {Function File} {} spectral_adf (@var{c}, @var{win}, @var{b}) |
| 3449 | 23 ## Return the spectral density estimator given a vector of |
| 24 ## autocovariances @var{c}, window name @var{win}, and bandwidth, | |
| 25 ## @var{b}. | |
| 3426 | 26 ## |
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27 ## The window name, e.g., @qcode{"triangle"} or @qcode{"rectangle"} is |
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28 ## used to search for a function called @code{@var{win}_lw}. |
| 3426 | 29 ## |
| 3449 | 30 ## If @var{win} is omitted, the triangle window is used. If @var{b} is |
| 31 ## omitted, @code{1 / sqrt (length (@var{x}))} is used. | |
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32 ## @seealso{spectral_xdf} |
| 3449 | 33 ## @end deftypefn |
| 3426 | 34 |
| 3457 | 35 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> |
| 36 ## Description: Spectral density estimation | |
| 3426 | 37 |
| 3191 | 38 function retval = spectral_adf (c, win, b) |
| 3426 | 39 |
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40 if (nargin < 1 || nargin > 3) |
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41 print_usage (); |
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42 endif |
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43 |
| 3191 | 44 cr = length (c); |
| 3426 | 45 |
| 3191 | 46 if (columns (c) > 1) |
| 8507 | 47 c = c'; |
| 3191 | 48 endif |
| 49 | |
| 50 if (nargin < 3) | |
| 51 b = 1 / ceil (sqrt (cr)); | |
| 52 endif | |
| 53 | |
| 54 if (nargin == 1) | |
| 55 w = triangle_lw (cr, b); | |
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56 elseif (! ischar (win)) |
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57 error ("spectral_adf: WIN must be a string"); |
| 3191 | 58 else |
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59 win = str2func ([win "_lw"]); |
| 3191 | 60 w = feval (win, cr, b); |
| 61 endif | |
| 3426 | 62 |
| 3191 | 63 c = c .* w; |
| 3426 | 64 |
| 3191 | 65 retval = 2 * real (fft (c)) - c(1); |
| 3238 | 66 retval = [(zeros (cr, 1)), retval]; |
| 3374 | 67 retval(:, 1) = (0 : cr-1)' / cr; |
| 3426 | 68 |
| 3191 | 69 endfunction |
| 70 | |
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71 |
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72 %% Test input validation |
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73 %!error spectral_adf (); |
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74 %!error spectral_adf (1, 2, 3, 4); |
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75 %!error spectral_adf (1, 2); |
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76 %!error spectral_adf (1, "invalid"); |
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77 |