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- ## Copyright (C) 1996,1998 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{n}, @var{nz}, @var{m}, @var{p},@var{yd}] =} sysdimensions (@var{sys}@{, @var{opt}@})
- ## return the number of states, inputs, and/or outputs in the system @var{sys}.
- ##
- ## @strong{Inputs}
- ## @table @var
- ## @item sys
- ## system data structure
- ##
- ## @item opt
- ## String indicating which dimensions are desired. Values:
- ## @table @code
- ## @item "all"
- ## (default) return all parameters as specified under Outputs below.
- ##
- ## @item "cst"
- ## return @var{n}= number of continuous states
- ##
- ## @item "dst"
- ## return @var{n}= number of discrete states
- ##
- ## @item "in"
- ## return @var{n}= number of inputs
- ##
- ## @item "out"
- ## return @var{n}= number of outputs
- ## @end table
- ## @end table
- ##
- ## @strong{Outputs}
- ## @table @var
- ## @item n
- ## number of continuous states (or individual requested dimension as specified
- ## by @var{opt}).
- ## @item nz
- ## number of discrete states
- ## @item m
- ## number of system inputs
- ## @item p
- ## number of system outputs
- ## @item yd
- ## binary vector; @var{yd}(@var{ii}) is nonzero if output @var{ii} is
- ## discrete.
- ## @math{yd(ii) = 0} if output @var{ii} is continous
- ## @end table
- ##
- ## @end deftypefn
-
- ## See also: sysgetsignals, sysgettsam
-
- function [n, nz, m, p, yd] = sysdimensions (sys, opt)
- if(nargout > 5 | nargin < 1 | nargin > 2)
- usage("[n,nz,m,p[,yd]] = sysdimensions(sys{,opt})");
- elseif(!is_struct(sys))
- usage("[n,nz,m,p] = sysdimensions(sys)");
- elseif(nargin == 1)
- opt = "all";
- endif
-
- n = sys.n;
- nz = sys.nz;
- m = length(sysgetsignals(sys,"in"));
- p = length(sysgetsignals(sys,"out"));
- yd = sys.yd;
- legal_options = list("all","cst","dst","st","in","out");
- legal_values = list(n,n,nz,n+nz,m,p);
-
- legal_opt = 0;
- for ii=1:length(legal_options)
- if(strcmp(nth(legal_options,ii),opt))
- n = nth(legal_values,ii);
- legal_opt = 1;
- if(ii > 1 & nargout > 1)
- warning("opt=%s, %d output arguments requested",opt,nargout);
- endif
- endif
- endfor
- if(!legal_opt)
- error("illegal option passed = %s",opt);
- endif
-
- endfunction
-