help me please if you have know how about x=[x1(:,:) x1(:,:)] ? what is doing it?
MATLAB: X=[x1(:,:) x1(:,:)]
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You need a mesh to create contour plot
bbfun = @(x1,x2) (4-2.1.*x1.^2+x1.^4/3).*x1.^2 + x1.*x2 + (-4+4*x2.^2) .*x2.^2; x1 = -2:1/100:2;x2 = -1.5:1/100:1.5;[X1, X2] = meshgrid(x1, x2);pltvar = bbfun(X1, X2);contour(X1, X2, pltvar,20)
Perhaps I'm misunderstanding but if
x = [1.0000 0 0.5000 1.0000 0.5000 1.5000 0 -1.0000 -1.0000 1.0000 0.5000 -1.0000];which is a 6x2 array, then wouldn't
x*x'be the desired 6x6 array?
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