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Is it differentiable ?
on 19 Oct 2021
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t = linspace(-0.001, 0.001, 1000);
[X, Y] = meshgrid(t,t);
f = @(x,y) sin(1./sqrt(x.^2 + y.^2)).*(x.^2 + y.^2);
Z = f(X,Y);
surf(X, Y, Z, EdgeColor="interp");
view(0,70)
colormap prism