| MATLAB Function Reference | |
Replace nonzero sparse matrix elements with ones
Syntax
R = spones(S)
Description
R = spones(S)
generates a matrix R with the same sparsity structure as S, but with 1's in the nonzero positions.
Examples
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).
See Also
nnz Number of nonzero matrix elements
spalloc Allocate space for sparse matrix
spfun Apply function to nonzero sparse matrix elements
| | spline | spparms | |