MATLAB: Mapping rows of an array to radii and columns to angles

laplace equationpolar

I am solving the Laplace equation using polar coordinates (r,θ). I get the solution in this form where the rows correspond to radii and the collumns correspond to angles and plot using imagesc(X):
Now I want to be able to plot the solution such that the rows map to concentric rings. The first row X(1,:) should map to the origin and the last row should map to the outermost 'ring'. Is there any way to do this?
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