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diff --git a/sourcecodes/bnt-master/netlab3.3/netderiv.m b/sourcecodes/bnt-master/netlab3.3/netderiv.m
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+function g = netderiv(w, net, x)
+%NETDERIV Evaluate derivatives of network outputs by weights generically.
+%
+%	Description
+%
+%	G = NETDERIV(W, NET, X) takes a weight vector W and a network data
+%	structure NET, together with the matrix X of input vectors, and
+%	returns the gradient of the outputs with respect to the weights
+%	evaluated at W.
+%
+%	See also
+%	NETEVFWD, NETOPT
+%
+
+%	Copyright (c) Ian T Nabney (1996-2001)
+
+fstr = [net.type, 'deriv'];
+net = netunpak(net, w);
+g = feval(fstr, net, x);