Plotting curvilinear coordinate function on Cartesian plane

General Usage
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Hi,
correct me if I’m wrong, but you just want to plot z as a function of x and y ? This is what you can do with PyPlot.jl, example with polar coordinates:

using PyPlot
s = range(0,1,length=100)
phi = range(0,2pi,length=100)'
x = @. s*cos(phi) # =f(s,phi)
y = @. s*sin(phi) # =g(s,phi)
z = @. s^2*sin(2phi) # =h(s,phi)

contourf(x,y,z)
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