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spy(S) spy(S,markersize) spy(S,'LineSpec') spy(S,'LineSpec',markersize)
spy(S)
plots the sparsity pattern of any matrix S.
spy(S,marksize),
where markersize is an integer, plots the sparsity pattern using markers of the specified point size.
spy(S,'LineSpec'),
where LineSpec is a string, uses the specified plot marker type and color.
spy(S,'LineSpec',markersize)
uses the specified type, color, and size for the plot markers.
S is usually a sparse matrix, but full matrices are acceptable, in which case the locations of the nonzero elements are plotted.
spy replaces format +, which takes much more space to display essentially the same information.
The gplot and LineSpec reference entries in the MATLAB Graphics Guide, and:
find Find indices and values of nonzero elements
symmmd Sparse symmetric minimum degree ordering
symrcm Sparse reverse Cuthill-McKee ordering