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2015-03-06 15:45:30 -0500 asked a question plot surface plus vector field

My apologies for posting a (hopefully) simple question. I want to plot a surface with the gradient field in the plane underneath. I can create the surface and vector field separately, but I get an error when I try to show them on the same axes. It seems that the vector field is a different type. Does anyone know how to induce the vector field so it can be plotted as part of a 3d plot?

I'd like to do something like this:


Everything but that last step works great, and then I get an error message:

NotImplementedError: 3D plotting not implemented for PlotField defined by a 20 x 20 vector grid

Can anyone suggest a workaround? Thanks for your help!