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annotate scripts/signal/spectral_xdf.m @ 14495:319660795df1

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Fix gnuplot error when color values are within eps of each other (bug #35761). * plot/private/__go_draw_axes__.m: Use %.15e for setting cbrange in gnuplot.
author Marco Caliari <marco.caliari@univr.it>
date Sun, 25 Mar 2012 13:53:39 -0700
parents 72c96de7a403
children 5d3a684236b0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1995-2012 Friedrich Leisch
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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} {} spectral_xdf (@var{x}, @var{win}, @var{b})
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21 ## Return the spectral density estimator given a data vector @var{x},
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22 ## window name @var{win}, and bandwidth, @var{b}.
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23 ##
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24 ## The window name, e.g., @code{"triangle"} or @code{"rectangle"} is
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25 ## used to search for a function called @code{@var{win}_sw}.
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26 ##
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27 ## If @var{win} is omitted, the triangle window is used. If @var{b} is
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28 ## omitted, @code{1 / sqrt (length (@var{x}))} is used.
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29 ## @end deftypefn
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30
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31 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
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32 ## Description: Spectral density estimation
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33
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Rik <octave@nomad.inbox5.com>
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34 function retval = spectral_xdf (x, win, b)
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36 xr = length (x);
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38 if (columns (x) > 1)
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39 x = x';
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40 endif
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41
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42 if (nargin < 3)
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43 b = 1 / ceil (sqrt (xr));
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44 endif
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45
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46 if (nargin == 1)
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47 w = triangle_sw (xr, b);
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48 else
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49 win = str2func (cstrcat (win, "_sw"));
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50 w = feval (win, xr, b);
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51 endif
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53 x = x - sum (x) / xr;
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55 retval = (abs (fft (x)) / xr).^2;
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56 retval = real (ifft (fft(retval) .* fft(w)));
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58 retval = [(zeros (xr, 1)), retval];
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59 retval(:, 1) = (0 : xr-1)' / xr;
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60
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61 endfunction
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