# Plotting an NDEigensystem solution over a helicoid

I am trying to plot the solutions of a particular Hamiltonian eigensystem over a helicoid. In other words, my solutions are a function of the radial variables (r,$$\phi$$). The Helicoid is given by the parametrization: (r cos(a$$\phi$$), r sin(a$$\phi$$), $$\phi$$).

How do I display the solutions over the Helicoid as a heatmap or something? The problem with Plot3D is that it treats the variables as (x,y) coordinates. Does RegionFunction help in this case?

The solutions are of the form {funs,vals} where funs is the list of all the eigenfunctions.

• – C. E. Aug 16 '19 at 18:23
• @C.E. Thank you, you're awesome. – Omar Shahpo Aug 16 '19 at 18:25