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xrot 1123
on 26 Oct 2021
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[x,y]=meshgrid(linspace(-10,10,800),linspace(-10,10,600));
z=(x.^2+y.^2-10+(x-1).*(y-2)+(x-1).*(y+2)+(x+1).*(y+2)+(x+1).*(y-2));
imagesc(z)
c=[gray;flipud(gray);bone;flipud(bone)];
colormap([c;c;jet;flipud(jet);c;c;c;c]);
axis off