%	This file displays four t-conorm operators%	Copyright by Jyh-Shing Roger Jang, 6-22-93.colormap('default');xx = 0:1:20;yy = 0:1:20;aa = 0:0.05:1;bb = 0:0.05:1;%bell_x = gbell_mf(xx, [4, 3, 10]);%bell_y = gbell_mf(yy, [4, 3, 10]);bell_x = trap_mf(xx, [3, 8, 12, 17]);bell_y = trap_mf(yy, [3, 8, 12, 17]);[x,y] = meshgrid(bell_x, bell_y);[a,b] = meshgrid(aa, bb); % a = mu(x), b = mu(y);subplot(221); mesh(aa, bb, max(a, b));view(-15, 30); xlabel('X = a'); ylabel('Y = b');set(gca, 'box', 'on');title('(a) Max');subplot(223); mesh(xx, yy, max(x, y));view(-15, 30); xlabel('X = x'); ylabel('Y = y');set(gca, 'box', 'on');subplot(222); mesh(aa, bb, a+b-a.*b);view(-15, 30); xlabel('X = a'); ylabel('Y = b');set(gca, 'box', 'on');title('(b) Algebraic Sum');subplot(224); mesh(xx, yy, x+y-x.*y);view(-15, 30); xlabel('X = x'); ylabel('Y = y');set(gca, 'box', 'on');figure;subplot(221); mesh(aa, bb, min(1, a+b));view(-15, 30); xlabel('X = a'); ylabel('Y = b');set(gca, 'box', 'on');title('(c) Bounded Sum');subplot(223); mesh(xx, yy, min(1, x+y));view(-15, 30); xlabel('X = x'); ylabel('Y = y');set(gca, 'box', 'on');z1 = ones(size(a));z1(find(b==0)) = a(find(b==0));z1(find(a==0)) = b(find(a==0));z2 = ones(size(x));z2(find(x==0)) = y(find(x==0));z2(find(y==0)) = x(find(y==0));subplot(222); mesh(aa, bb, z1);view(-15, 30); xlabel('X = a'); ylabel('Y = b');set(gca, 'box', 'on');title('(d) Drastic Sum');subplot(224); mesh(xx, yy, z2);view(-15, 30); xlabel('X = x'); ylabel('Y = y');set(gca, 'box', 'on');