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+++ b/scripts/sparse/spfun.m
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+## Copyright (C) 2004 David Bateman & Andy Adler
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+##
+## This program 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 this program; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{y} =} spfun (@var{f},@var{x})
+## Compute @code{f(@var{x})} for the non-zero values of @var{x}.
+## This results in a sparse matrix with the same structure as 
+## @var{x}. The function @var{f} can be passed as a string, a
+## function handle or an inline function.
+## @end deftypefn
+
+function t = spfun(f,s)
+  if (nargin != 2)
+    usage ("spfun(f,s)")
+  endif
+
+  if issparse(s)
+    [i,j,v,m,n] = spfind(s);
+  else
+    [i,j,v] = find(s);
+    [m,n] = size(s);
+  end
+
+  if (isa (f, "function handle") || isa (f, "inline function"))
+    t = sparse(i,j,f(v),m,n);
+  else
+    t = 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]))
+