SPY3D(S) plots the sparsity pattern of the matrix S in a three-dimensional (3D) domain with matrix entries represented as bars that are colored according to their value (height) and using a colorbar.
Francisco Ramírez (2021). spy3D (https://www.mathworks.com/matlabcentral/fileexchange/70193-spy3d), MATLAB Central File Exchange. Retrieved .
Inspired by: spyc: a color-coded version of sparse matrix viewer spy, cspy.m, spyx.m, spy2.m
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