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| spones | Examples See Also |
Replace nonzero sparse matrix elements with ones
R = spones(S)
R = spones(S)
generates a matrix R with the same sparsity structure as S, but with 1's in the nonzero positions.
c = sum(spones(S)) is the number of nonzeros in each column.
r = sum(c) and sum(r) are equal, and are equal to nnz(S).
nnz Number of nonzero matrix elements
spalloc Allocate space for sparse matrix
spfun Apply function to nonzero sparse matrix elements