--- /dev/null
+%% Copyright (C) 2010, 2011 Olaf Till <i7tiol@t-online.de>
+%%
+%% 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 3 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, see <http://www.gnu.org/licenses/>.
+
+%% function prt = dcdp (f, p, dp, func[, bounds])
+%%
+%% This is an interface to __dfdp__.m, similar to dfdp.m, but for
+%% functions only of parameters 'p', not of independents 'x'. See
+%% dfdp.m.
+%%
+%% dfpdp is more general and is meant to be used instead of dcdp in
+%% optimization.
+
+function prt = dcdp (f, p, dp, func, bounds)
+
+ if (ischar (func))
+ func = str2func (func);
+ end
+
+ hook.f = f;
+
+ if (nargin > 4)
+ hook.lbounds = bounds(:, 1);
+ hook.ubounds = bounds(:, 2);
+ end
+
+ hook.diffp = abs (dp);
+ hook.fixed = dp == 0;
+ hook.diff_onesided = dp < 0;
+
+ prt = __dfdp__ (p, func, hook);