I have tried plotting in 3D using PyPlot, and the code are: using PyPlot x = linspace(0,2*pi,1000) y = sin(3*x + 4*cos(2*x)) z = [sqrt(i)for i in (x.*x + y.*y)] grid() plot3D(x, y, z)# color="red", linewidth=2.0, linestyle="--")
but error when running, the graph does not appear. any one can help me please?
