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diff --git a/sourcecodes/bnt-master/netlab3.3/netgrad.m b/sourcecodes/bnt-master/netlab3.3/netgrad.m
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+function g = netgrad(w, net, x, t)
+%NETGRAD Evaluate network error gradient for generic optimizers
+%
+%	Description
+%
+%	G = NETGRAD(W, NET, X, T) takes a weight vector W and a network data
+%	structure NET, together with the matrix X of input vectors and the
+%	matrix T of target vectors, and returns the gradient of the error
+%	function evaluated at W.
+%
+%	See also
+%	MLP, NETERR, NETOPT
+%
+
+%	Copyright (c) Ian T Nabney (1996-2001)
+
+gradstr = [net.type, 'grad'];
+
+net = netunpak(net, w);
+
+g = feval(gradstr, net, x, t);