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## Copyright (C) 2004-2013 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{y} =} spfun (@var{f}, @var{S})
## Compute @code{f(@var{S})} for the non-zero values of @var{S}.
## This results in a sparse matrix with the same structure as
## @var{S}. The function @var{f} can be passed as a string, a
## function handle, or an inline function.
## @seealso{arrayfun, cellfun, structfun}
## @end deftypefn
function y = spfun (f, S)
if (nargin != 2)
print_usage ();
endif
[i, j, v] = find (S);
[m, n] = size (S);
if (isa (f, "function_handle") || isa (f, "inline function"))
y = sparse (i, j, f(v), m, n);
else
y = sparse (i, j, feval (f, v), m, n);
endif
endfunction
%!assert (spfun ("exp", [1,2;3,0]), sparse ([exp(1),exp(2);exp(3),0]))
%!assert (spfun ("exp", sparse ([1,2;3,0])), sparse ([exp(1),exp(2);exp(3),0]))
%!assert (spfun (@exp, [1,2;3,0]), sparse ([exp(1),exp(2);exp(3),0]))
%!assert (spfun (@exp, sparse ([1,2;3,0])), sparse ([exp(1),exp(2);exp(3),0]))
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