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function net = netunpak(net, w)
%NETUNPAK Separates weights vector into weight and bias matrices.
%
% Description
% NET = NETUNPAK(NET, W) takes an net network data structure NET and a
% weight vector W, and returns a network data structure identical to
% the input network, except that the componenet weight matrices have
% all been set to the corresponding elements of W. If there is a MASK
% field in the NET data structure, then the weights in W are placed in
% locations corresponding to non-zero entries in the mask (so W should
% have the same length as the number of non-zero entries in the MASK).
%
% See also
% NETPAK, NETFWD, NETERR, NETGRAD
%
% Copyright (c) Ian T Nabney (1996-2001)
unpakstr = [net.type, 'unpak'];
% Check if we are being passed a masked set of weights
if (isfield(net, 'mask'))
if length(w) ~= size(find(net.mask), 1)
error('Weight vector length does not match mask length')
end
% Do a full pack of all current network weights
pakstr = [net.type, 'pak'];
fullw = feval(pakstr, net);
% Replace current weights with new ones
fullw(logical(net.mask)) = w;
w = fullw;
end
net = feval(unpakstr, net, w);
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