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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(spones(S'))' is the number of nonzeros
in each row.
sum(c) and sum(r) are
equal, and are equal to nnz(S).
nnz | spalloc | spfun
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