If I have a function
using Plots
f(x,c)=x^2+6x+(c/x)
how do I make it into a 3d plot like a topographic map?
Something like
surface(-3:0.1:3, -3:0.1:3, f)
and/or
contour(-3:0.1:3, -3:0.1:3, f)
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