R = spones(S)
R = spones(S)
generates a matrix R
with the same sparsity structure as S
, but with 1s 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)
.
(c) Copyright 1994 by The MathWorks, Inc.