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## Copyright (C) 1996, 1998, 2000, 2002, 2004, 2005, 2006, 2007
## Auburn University. All rights reserved.
##
##
## This program 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.
##
## This program 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 this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} syssetsignals (@var{sys}, @var{opt}, @var{names}, @var{sig_idx})
## change the names of selected inputs, outputs and states.
##
## @strong{Inputs}
## @table @var
## @item sys
## System data structure.
##
## @item opt
## Change default name (output).
##
## @table @code
## @item "out"
## Change selected output names.
## @item "in"
## Change selected input names.
## @item "st"
## Change selected state names.
## @item "yd"
## Change selected outputs from discrete to continuous or
## from continuous to discrete.
## @end table
##
## @item names
## @table @code
## @item opt = "out", "in", "st"
## string or string array containing desired signal names or values.
## @item opt = "yd"
## To desired output continuous/discrete flag.
## Set name to 0 for continuous, or 1 for discrete.
## @end table
## @item sig_idx
## indices or names of outputs, yd, inputs, or
## states whose respective names/values should be changed.
##
## Default: replace entire cell array of names/entire yd vector.
## @end table
##
## @strong{Outputs}
## @table @var
## @item retsys
## @var{sys} with appropriate signal names changed
## (or @var{yd} values, where appropriate).
## @end table
##
## @strong{Example}
## @example
## octave:1> sys=ss ([1 2; 3 4],[5;6],[7 8]);
## octave:2> sys = syssetsignals (sys, "st",
## > str2mat("Posx","Velx"));
## octave:3> sysout(sys)
## Input(s)
## 1: u_1
## Output(s):
## 1: y_1
## state-space form:
## 2 continuous states, 0 discrete states
## State(s):
## 1: Posx
## 2: Velx
## A matrix: 2 x 2
## 1 2
## 3 4
## B matrix: 2 x 1
## 5
## 6
## C matrix: 1 x 2
## 7 8
## D matrix: 1 x 1
## 0
## @end example
## @end deftypefn
## Author: John Ingram <ingraje@eng.auburn.edu>
## Created: August 1996
function retsys = syssetsignals (sys, opt, names, sig_idx)
if (nargin < 3 || nargin > 4)
print_usage ();
elseif (! isstruct (sys))
error ("sys must be a system data structure");
elseif (isempty (opt))
opt = "out";
elseif (! ischar (opt))
error ("opt must be a string");
elseif (! (strcmp (opt, "out") || strcmp (opt, "yd")
|| strcmp (opt, "in") || strcmp (opt, "st")))
error ("opt must be one of [], \"out\", \"yd\", \"in\", or \"st\"");
elseif (nargin == 4)
if (is_signal_list (sig_idx) || ischar (sig_idx))
## convert to vector of indices
if (opt == "yd")
sig_idx = sysidx (sys, "out", sig_idx);
else
sig_idx = sysidx (sys, opt, sig_idx);
endif
endif
## check index vector
if (min (size (sig_idx)) > 1)
disp ("syssetsignals: sig_idx=")
disp (sig_idx);
error ("sig_idx must be a vector")
endif
endif
sig_vals = sysgetsignals (sys, opt);
## make sure it's in state space form if state names are given
if (strcmp (opt, "st"))
sys = sysupdate (sys, "ss");
endif
if (strcmp (opt, "yd") == 0)
## it's a signal name list we're changing
if (! iscell (names))
names = {names};
endif
if (! is_signal_list (names) && ! isempty (names))
if (ischar (names{1}))
tmpstr = names{1};
for ii=1:rows(tmpstr)
names{ii} = deblank(tmpstr(ii,:));
endfor
else
error ("parameter \"names\" must be a cell array of strings");
endif
endif
nsigs = length (sig_vals);
if (nargin == 3)
## replace all signal names
if (length (names) != nsigs)
error ("opt=%s, sig_idx omitted: names(len=%d) should have %d entries ",
opt, length (names), nsigs);
endif
sig_idx = 1:nsigs;
elseif (length (names) != length (sig_idx))
## replace specified signal names
error ("opt=%s, sig_idx(len=%d), names(len=%d) mismatch",
opt, length (sig_idx), length (names));
endif
for ii = 1:length(sig_idx)
jj = sig_idx(ii);
if (jj < 1 || jj > nsigs || jj != floor (jj+0.5))
error ("opt=%s, sig_idx(%d)=%d, %e: must be an integer between 1 and %d",
opt, ii, jj, jj, nsigs);
endif
sig_vals{jj} = names{ii};
endfor
else
## update yd
## 1st check pathological case: no outputs
nout = sysdimensions (sys, "out");
if (nout == 0)
if (nargin != 3)
error ("opt=%s, %d outputs, sysgetsignals cannot take 4 arguments",
opt, nout);
endif
if (! isempty (names))
error ("opt=%s, %d outputs, names is not empty", opt, nout);
endif
sigvals = [];
else
nsigs = length (sig_vals);
if (! isvector (names))
error ("syssetsignals: opt=%s, names(%dx%d) must be a vector",
opt, rows (names), columns (names));
endif
if (nargin == 3)
if (length (names) != nsigs)
error ("opt=%s, sig_idx omitted: names(%d) should be length(%d)",
opt, length (names), nsigs);
endif
sig_idx = 1:nsigs;
elseif (length(names) != length (sig_idx))
error ("opt=%s: length(names)=%d, length(sig_idx)=%d",
opt, length (names), length (sig_idx));
endif
badidx = find (names != 0 & names != 1);
if (! isempty (badidx))
for ii = 1:length(badidx)
warning ("syssetsignals: opt=%s: names(%d)=%e, must be 0 or 1",
opt, badidx(ii), names(badidx(ii)) );
endfor
error ("opt=%s: invalid values in names", opt);
endif
for ii = 1:length(sig_idx)
jj = sig_idx(ii);
if (jj < 1 || jj > nsigs || jj != floor (jj))
error ("sig_idx(%d)=%d, %e: must be an integer between 1 and %d",
ii, jj, jj, nsigs);
endif
sig_vals(jj) = names(ii);
endfor
if (any (sig_vals == 1) && sysgettsam (sys) == 0)
warning ("Setting system sampling time to 1");
printf ("syssetsignals: original system sampling time=0 but output(s)\n");
disp (find (sig_vals == 1))
printf ("are digital\n");
sys = syschtsam (sys, 1);
endif
endif
endif
if (strcmp (opt, "st"))
sys.stname = sig_vals;
elseif (strcmp (opt, "in"))
sys.inname = sig_vals;
elseif (strcmp (opt, "out"))
sys.outname = sig_vals;
elseif (strcmp (opt, "yd"))
sys.yd = sig_vals;
endif
retsys = sys;
endfunction
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