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diff --git a/octave_packages/m/prefs/setpref.m b/octave_packages/m/prefs/setpref.m
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+## Copyright (C) 2012 John W. Eaton
+##
+## 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} {} setpref (@var{group}, @var{pref}, @var{val})
+## Set a preference @var{pref} to the given @var{val} in the named
+## preference group @var{group}.
+##
+## The named preference group must be a character string.
+##
+## The preference @var{pref} may be a character string or a cell array
+## of character strings.  The corresponding value @var{val} may be any
+## value, or, if @var{pref} is a cell array of strings, @var{val}
+## must be a cell array of values with the same size as @var{pref}.
+##
+## If the named preference or group does not exist, it is added.
+## @seealso{addpref, getpref, ispref, rmpref}
+## @end deftypefn
+
+## Author: jwe
+
+function setpref (group, pref, val)
+
+  if (nargin == 3)
+    if (ischar (group))
+      prefs = loadprefs ();
+      if (ischar (pref))
+        prefs.(group).(pref) = val;
+      elseif (iscellstr (pref))
+        if (size_equal (pref, val))
+          for i = 1:numel(pref)
+            prefs.(group).(pref{i}) = val;
+          endfor
+        else
+          error ("size mismatch for pref and val");
+        endif
+      else
+        error ("expecting pref to be a character string or cellstr");
+      endif
+      saveprefs (prefs);
+    else
+      error ("expecting group to be a character string");
+    endif
+  else
+    print_usage ();
+  endif
+
+endfunction
+
+%% Testing these functions will require some care to avoid wiping out
+%% existing (or creating unwanted) preferences for the user running the
+%% tests.