show_op.m

FISMAT accommodates different arithmetic operators, fuzzification and defuzzification algorithm, imp

function [x,y,m] = show_op(op,par,op2,par2)

% [x,y,m] = show_op(op,par,op2,par2)
%
% Presentation of a setoperations as a 3D graphik and checkerboard plot.
% If invoke without lefthand arguments the graphiks is plotted. 
% Otherwise a matrix for use with mesh, surf, contour etc. is returned. 
% (For scaling the the x and y vectors in this file.)
% The ranges: 0 < x < 1 and 0 < y < 1 .
% 
% par is the method to be used (e.g or()) or for example the GAMMA-operator
% IF only one parameter is passed, one two value operator is assumed.
% For comparing two operators or one with different parameters, maximal two
% operators and two parameters can be passed.
%
% The resolution is set to 20. If another value is needed, the value for 
% resxy in this first line of this file must be changed.
% op must be given as a string: ''.
%
% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK
%
% 12-May-1994
 
resxy=20;

x = 0:1/resxy:1; y = x;
[a,b] = meshgrid(x,y);

if nargin==1,                     % one two value operator.
  m = feval(op,a,b);
elseif (nargin==2 & ~isstr(par)), % one two value operator with a parameter.
  m = feval(op,par,a,b);
elseif (nargin==2 & isstr(par)),  % two one value operators.
  m = feval(op,a,b);
  m2= feval(par,a,b);
elseif (nargin==3 & isstr(par)), % first op. with parameter, second without.
  m = feval(op,par,a,b);
  m2= feval(op2,a,b);
elseif (nargin==3 & ~isstr(par)), 
  m = feval(op,a,b);           % second op. with parameter, first without.
  m2= feval(par,op2,a,b);
elseif nargin==4,              % two one value operators and two parameters.
  m = feval(op,par,a,b);
  m2= feval(op2,par2,a,b);
end;

if nargout == 0,
  if (nargin==1), 
    surf(x,y,m);
  elseif (nargin==2 & ~isstr(par)),
    surf(x,y,m);
  else
    subplot(2,2,1), surf(x,y,m); grid on
    subplot(2,2,2), surf(x,y,m2); grid on
    subplot(2,2,3), pcolor(x,y,m);
    subplot(2,2,4), pcolor(x,y,m2);
  end;
end;