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25
26## -*- texinfo -*-
27## @deftypefn {} {@var{r} =} spones (@var{S})
28## Replace the nonzero entries of @var{S} with ones.
29##
30## This creates a sparse matrix with the same structure as @var{S}.
31## @seealso{sparse, sprand, sprandn, sprandsym, spfun, spy}
32## @end deftypefn
33
34function r = spones (S)
35
36  if (nargin != 1)
37    print_usage ();
38  endif
39
40  [i, j, v] = find (S);
41  [m, n] = size (S);
42
43  r = sparse (i, j, 1, m, n);
44
45endfunction
46
47
48%!assert (issparse (spones ([1,2;3,0])))
49%!assert (spones ([1,2;3,0]), sparse ([1,1;1,0]))
50%!assert (spones (sparse ([1,2;3,0])), sparse ([1,1;1,0]))
51