update packages

[CreaPhase.git] / octave_packages / m / sparse / spones.m

diff --git a/octave_packages/m/sparse/spones.m b/octave_packages/m/sparse/spones.m
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+## Copyright (C) 2004-2012 David Bateman and Andy Adler
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{r} =} spones (@var{S})
+## Replace the non-zero entries of @var{S} with ones.  This creates a
+## sparse matrix with the same structure as @var{S}.
+## @end deftypefn
+
+function r = spones (S)
+
+  if (nargin != 1)
+    print_usage ();
+  endif
+
+  [i, j, v] = find (S);
+  [m, n] = size (S);
+
+  r = sparse (i, j, 1, m, n);
+
+endfunction
+
+%!assert(issparse(spones([1,2;3,0])))
+%!assert(spones([1,2;3,0]),sparse([1,1;1,0]))
+%!assert(spones(sparse([1,2;3,0])),sparse([1,1;1,0]))