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- ## Copyright (C) 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{systype} =} sysgetty ( @var{sys} )
- ## return the initial system type of the system
- ##
- ## @strong{Inputs}
- ## @var{sys}: system data structure
- ##
- ## @strong{Outputs}
- ## @var{systype}: string indicating how the structure was initially
- ## constructed:
- ## values: @code{"ss"}, @code{"zp"}, or @code{"tf"}
- ##
- ## @strong{Note} FIR initialized systems return @code{systype="tf"}.
- ##
- ##
- ## @end deftypefn
-
- function systype = sysgetty (sys)
-
- if(!is_struct(sys))
- error("sysgetty: input sys is not a structure");
- endif
-
- typestr = list("tf","zp","ss");
- systype = nth(typestr,sys.sys(1) + 1);
- endfunction
-