# spones

## Purpose

Replace nonzero elements with ones.

## Synopsis

    R = spones(S)

## Description

`R = spones(S)` generates a matrix `R` with the same sparsity structure as `S`, but with 1s 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)`.

(c) Copyright 1994 by The MathWorks, Inc.