Mercurial > octave
view scripts/signal/fractdiff.m @ 31551:fd29c7a50a78 stable
maint: use commas, semicolons consistently with Octave conventions.
* makeValidName.m: Remove %!test and move BIST %!asserts to column 1.
* base64decode.m, base64encode.m, which.m, logm.m, uniquetol.m, perms.m:
Delete semicolon (';') at end of %!assert BIST.
* lin2mu.m, interp2.m, interpn.m, lsqnonneg.m, pqpnonneg.m, uniquetol.m,
betainc.m, normalize.m: Add semicolon (';') to end of assert statement within
%!test BIST.
* __memoize__.m, tar_is_bsd.m, publish.m: Add semicolon (';') to line with
keyword "persistent".
* stft.m: Use comma (',') after "case" keyword when code immediately follows.
* gallery.m: Align commas used in case statements in massive switch block.
Remove unnecessary parentheses around a numeric case argument.
* ranks.m: Remove semicolon (';') from case statemnt argument.
author | Rik <rik@octave.org> |
---|---|
date | Sat, 26 Nov 2022 06:32:08 -0800 |
parents | 5d3faba0342e |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 1995-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{fd} =} fractdiff (@var{x}, @var{d}) ## Compute the fractional differences @math{(1-L)^d x} where @math{L} ## denotes the lag-operator and @math{d} is greater than -1. ## @end deftypefn function retval = fractdiff (x, d) if (nargin != 2) print_usage (); endif N = 100; if (! isvector (x)) error ("fractdiff: X must be a vector"); endif if (! isscalar (d)) error ("fractdiff: D must be a scalar"); endif if (d >= 1) for k = 1 : d x = x(2 : length (x)) - x(1 : length (x) - 1); endfor endif if (d > -1) d = rem (d, 1); if (d != 0) n = (0 : N)'; w = real (gamma (-d+n) ./ gamma (-d) ./ gamma (n+1)); retval = fftfilt (w, x); retval = retval(1 : length (x)); else retval = x; endif else error ("fractdiff: D must be > -1"); endif endfunction