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function [e, varargout] = neterr(w, net, x, t)
%NETERR Evaluate network error function for generic optimizers
%
% Description
%
% E = NETERR(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 value of the error
% function evaluated at W.
%
% [E, VARARGOUT] = NETERR(W, NET, X, T) also returns any additional
% return values from the error function.
%
% See also
% NETGRAD, NETHESS, NETOPT
%
% Copyright (c) Ian T Nabney (1996-2001)
errstr = [net.type, 'err'];
net = netunpak(net, w);
[s{1:nargout}] = feval(errstr, net, x, t);
e = s{1};
if nargout > 1
for i = 2:nargout
varargout{i-1} = s{i};
end
end
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