/usr/share/octave/packages/control-2.6.2/@lti/connect.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 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | ## 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{sys} =} connect (@var{sys1}, @var{sys2}, @dots{}, @var{sysN}, @var{inputs}, @var{outputs})
## @deftypefnx {Function File} {@var{sys} =} connect (@var{sys}, @var{cm}, @var{inputs}, @var{outputs})
## Name-based interconnections between the inputs and outputs of @acronym{LTI} models.
##
## @strong{Inputs}
## @table @var
## @item sys1, @dots{}, sysN
## @acronym{LTI} models to be connected. The properties 'inname' and 'outname'
## of each model should be set according to the desired input-output connections.
## @item inputs
## String or cell of strings containing the names of the inputs to be kept.
## The names must be part of the properties 'ingroup' or 'inname'.
## @item outputs
## String or cell of strings containing the names of the outputs to be kept.
## The names must be part of the properties 'outgroup' or 'outname'.
## @item cm
## Legacy connection matrix (not name-based).
## @end table
##
## @strong{Outputs}
## @table @var
## @item sys
## Resulting interconnected system with outputs @var{outputs} and
## inputs @var{inputs}.
## @end table
##
## @seealso{sumblk}
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2009
## Version: 0.2
function sys = connect (varargin)
if (nargin < 2)
print_usage ();
endif
if (is_real_matrix (varargin{2})) # connect (sys, cm, in_idx, out_idx)
if (nargin != 4)
print_usage ();
endif
sys = varargin{1};
cm = varargin{2};
in_idx = varargin{3};
out_idx = varargin{4};
[p, m] = size (sys);
[cmrows, cmcols] = size (cm);
## TODO: proper argument checking
## TODO: replace nested for-if statement
## if (! is_real_matrix (cm))
## error ("connect: second argument must be a matrix with real-valued coefficients");
## endif
M = zeros (m, p);
in = cm(:, 1);
out = cm(:, 2:cmcols);
for a = 1 : cmrows
for b = 1 : cmcols-1
if (out(a, b) != 0)
M(in(a, 1), abs (out(a, b))) = sign (out(a, b));
endif
endfor
endfor
sys = __sys_connect__ (sys, M);
sys = __sys_prune__ (sys, out_idx, in_idx);
else # connect (sys1, sys2, ..., sysN, in_idx, out_idx)
lti_idx = cellfun (@isa, varargin, {"lti"});
sys = append (varargin{lti_idx});
io_idx = ! lti_idx;
if (nnz (io_idx) != 2)
error ("connect: require arguments 'inputs' and 'outputs'");
endif
in_idx = varargin(io_idx){1};
out_idx = varargin(io_idx){2};
inname = sys.inname;
outname = sys.outname;
ioname = intersect (inname, outname);
tmp = cellfun (@(x) find (strcmp (inname, x)(:)), ioname, "uniformoutput", false);
inputs = vertcat (tmp{:}); # there could be more than one input with the same name
## FIXME: sys_prune will error out if names in out_idx and in_idx are not unique
## the dark side handles cases with common in_idx names
[p, m] = size (sys);
M = zeros (m, p);
for k = 1 : length (inputs)
outputs = strcmp (outname, inname(inputs(k)));
M(inputs(k), :) = outputs;
endfor
sys = __sys_connect__ (sys, M);
sys = __sys_prune__ (sys, out_idx, in_idx);
if (isa (sys, "ss"))
sys = sminreal (sys);
endif
endif
endfunction
%!shared T, Texp
%! P = Boeing707;
%! I = ss (-eye (2));
%! I.inname = P.outname;
%! I.outname = P.inname;
%! T = connect (P, I, P.inname, P.outname);
%! Texp = feedback (P);
%!assert (T.a, Texp.a, 1e-4);
%!assert (T.b, Texp.b, 1e-4);
%!assert (T.c, Texp.c, 1e-4);
%!assert (T.d, Texp.d, 1e-4);
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