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on 25 Oct 2021
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[x,y]=meshgrid(linspace(-10,10,400),linspace(-10,10,300));
z=x.*y.*(abs(x)-y);
%z=(x-.5).*(x+.5)./(y.*x)+y.*x+x.*x.*y-x./(1+y.^2)+1./(1+x.^2+(y-2).^2);
%shading interp
imagesc(z)
c=[gray;flipud(gray);bone;flipud(bone)];
colormap([c;c;c;c]);
%colormap gray
colorbar
axis off
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