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minfo.m
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1999-12-24
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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.
## function [systype, nout, nin, ncstates, ndstates] = minfo(inmat)
##
## MINFO: Determines the type of system matrix. INMAT can be
## a varying(*), system, constant, and empty matrix.
##
## Returns:
## systype can be one of:
## varying, system, constant, and empty
## nout is the number of outputs of the system
## nin is the number of inputs of the system
## ncstates is the number of continuous states of the system
## ndstates is the number of discrete states of the system
function [systype, nout, nin, ncstates, ndstates] = minfo (inmat)
## Written by R. Bruce Tenison July 29, 1994
## Modified by David Clem November 13, 1994
## Modified by A. S. Hodel July 1995
warning("minfo: obsolete. Use sys2ss, sys2tf, or sys2zp.");
if (nargin ~= 1 )
disp('MINFO: Wrong number of arguments')
systype = nout = nin = ncstates = ndstates = [];
endif
[rr,cc] = size(inmat);
## Check for empty matrix first!
if (isempty(inmat))
systype = "empty";
nout = nin = ncstates = ndstates = 0;
return
## Check for Constant matrix
elseif (rr == 1 || cc == 1)
systype = "constant";
nout = nin = ncstates = ndstates = 1;
return
## Check for system type matrix
elseif (inmat(rr,cc) == -Inf)
systype = "system";
ncstates = inmat(1,cc);
ndstates = inmat(rr,1);
nstates = ncstates + ndstates;
nout = rr - nstates - 1;
nin = cc - nstates - 1;
## Check for Varying type matrix
elseif (inmat(rr,cc) == Inf)
systype = "varying";
npoints = inmat(rr,cc-1);
nin = cc - 1;
nout = rr / npoints;
nstates = 0;
## Must be a standard matrix
else
systype = "constant";
nin = cc;
nout = rr;
ncstates = 0;
ndstates = 0;
endif
endfunction