Mercurial > octave
view scripts/control/syscont.m @ 3346:8dd4718801fd
[project @ 1999-11-09 18:18:12 by jwe]
author | jwe |
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date | Tue, 09 Nov 1999 18:18:37 +0000 |
parents | f7e4a95916f2 |
children | 69b167451491 |
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# Copyright (C) 1996 Auburn University. All Rights Reserved. # # 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 2, 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, write to the Free # Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. ## -*- texinfo -*- ## @deftypefn {Function File} { [@var{csys}, @var{Acd}, @var{Ccd}] = } syscont (@var{sys}) ## Extract the purely continuous subsystem of an input system. ## ## @strong{Inputs} ## @var{sys} is a system data structure ## ## @strong{Outputs} ## @table @var ## @item csys ## is the purely continuous input/output connections of @var{sys} ## @item Acd, Ccd: ## connections from discrete states to continuous states, ## discrete states to continuous outputs, respectively. ## ## returns @var{csys} empty if no continuous/continous path exists ## @end table ## ## @end deftypefn function [csys,Acd,Ccd] = syscont(sys) # Written by John Ingram August 1996 save_val = implicit_str_to_num_ok; # save for later save_empty = empty_list_elements_ok; empty_list_elements_ok = implicit_str_to_num_ok = 1; if (nargin != 1) usage("[csys,Acd,Ccd,Dcd] = syscont(sys)"); elseif (!is_struct(sys)) error("sys must be in system data structure form"); endif sys = sysupdate(sys,"ss"); [n_tot,st_c,st_d,y_c,y_d] = syscont_disc(sys); # get ranges # assume there's nothing there; build partitions as appropriate Acc = Acd = Bcc = Ccc = Ccd = Dcc = []; if(isempty(st_c) & isempty(y_c)) error("syscont: expecting continous states and/or continous outputs"); elseif (isempty(st_c)) warning("syscont: no continuous states"); elseif(isempty(y_c)) warning("syscont: no continuous outputs"); endif [sys_a, sys_b, sys_c, sys_d ] = sys2ss(sys); [sys_stname, sys_inname, sys_outname] = sysgetsignals(sys); [sys_n, sys_nz, sys_m, sys_p] = sysdimensions(sys); if(!isempty(st_c)) Acc = sys_a(st_c,st_c); stname = sys_stname(st_c); Bcc = sys_b(st_c,:); Ccc = sys_c(y_c,st_c); Acd = sys_a(st_c,st_d); else stname=[]; endif outname = sys_outname(y_c); Dcc = sys_d(y_c,:); Ccd = sys_c(y_c,st_d); inname = sys_inname; csys = ss2sys(Acc,Bcc,Ccc,Dcc,0,sys_n,0,stname,inname,outname); implicit_str_to_num_ok = save_val; # restore value empty_list_elements_ok = save_empty; endfunction