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You should give more details on how is your function defined, the answer depends on this. Let me assume that you have a symbolic function like:
f(x,y) = cos(x+I*y)
You can see its norm as follows:
plot3d(lambda x,y: abs(f(x,y)),[-5,5],[-1,1])
You can see its argument as follows (note that you will have a discontinuity at -pi=pi):
plot3d(lambda x,y: arg(f(x,y)),[-5,5],[-1,1])
