Plot a two dimensional mesh
plot2d_mesh(mesh, color = "black", ...)2-dimensional mesh to draw
color of the mesh
optional arguments passed to plot function
plot2d_mesh(mesh_exsets(f = function(x) sin(pi*x[1])*sin(pi*x[2]),
threshold=0,sign=1, mesh="unif",mesh.size=11,
intervals = matrix(c(1/2,5/2,1/2,5/2),nrow=2)))
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