/usr/share/octave/packages/control-2.6.2/@lti/filtdata.m is in octave-control 2.6.2-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | ## Copyright (C) 2009-2014 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{num}, @var{den}, @var{tsam}] =} filtdata (@var{sys})
## @deftypefnx {Function File} {[@var{num}, @var{den}, @var{tsam}] =} filtdata (@var{sys}, @var{"vector"})
## Access discrete-time transfer function data in DSP format.
## Argument @var{sys} is not limited to transfer function models.
## If @var{sys} is not a transfer function, it is converted automatically.
##
## @strong{Inputs}
## @table @var
## @item sys
## Any type of discrete-time @acronym{LTI} model.
## @item "v", "vector"
## For SISO models, return @var{num} and @var{den} directly as column vectors
## instead of cells containing a single column vector.
## @end table
##
## @strong{Outputs}
## @table @var
## @item num
## Cell of numerator(s). Each numerator is a row vector
## containing the coefficients of the polynomial in ascending powers of z^-1.
## num@{i,j@} contains the numerator polynomial from input j to output i.
## In the SISO case, a single vector is possible as well.
## @item den
## Cell of denominator(s). Each denominator is a row vector
## containing the coefficients of the polynomial in ascending powers of z^-1.
## den@{i,j@} contains the denominator polynomial from input j to output i.
## In the SISO case, a single vector is possible as well.
## @item tsam
## Sampling time in seconds. If @var{tsam} is not specified, -1 is returned.
## @end table
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: April 2012
## Version: 0.1
function [num, den, tsam] = filtdata (sys, rtype = "cell")
if (nargin > 2)
print_usage ();
endif
if (! isdt (sys))
error ("lti: filtdata: require discrete-time system");
endif
[num, den, tsam] = tfdata (sys);
## make numerator and denominator polynomials equally long
## by adding leading zeros
lnum = cellfun (@length, num, "uniformoutput", false);
lden = cellfun (@length, den, "uniformoutput", false);
lmax = cellfun (@max, lnum, lden, "uniformoutput", false);
num = cellfun (@prepad, num, lmax, "uniformoutput", false);
den = cellfun (@prepad, den, lmax, "uniformoutput", false);
## remove trailing zeros
## such that polynomials are as short as possible
num = cellfun (@__remove_trailing_zeros__, num, "uniformoutput", false);
den = cellfun (@__remove_trailing_zeros__, den, "uniformoutput", false);
if (strncmpi (rtype, "v", 1) && issiso (sys))
num = num{1};
den = den{1};
endif
endfunction
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