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Bessel triangle
on 20 Oct 2021
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[x,y]=meshgrid(-10:.01:10);
b=@(p,q)besselj(0,(((x-p).^2+(y-q).^2).^0.5));
mesh(x,y,b(2,0)+b(-1,1.732)+b(-1,-1.732))
colormap(gca,'colorcube')
view(0,90)
axis equal off