You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mlpderiv.m
    path of file: ./repos/pcm/matlab/lib/netlab3_3
    
    the code of the file until where you have to start completion: function g = mlpderiv(net, x)
%MLPDERIV Evaluate derivatives of network outputs with respect to weights.
%
%	Description
%	G = MLPDERIV(NET, X) takes a network data structure NET and a matrix
%	of input vectors X and returns a three-index matrix G whose I, J, K
%	element contains the derivative of network output K with respect to
%	weight or bias parameter J for input pattern I. The ordering of the
%	weight and bias parameters is defined by MLPUNPAK.
%
%	See also
%	MLP, MLPPAK, MLPGRAD, MLPBKP
%

%	Copyright (c) Ian T Nabney (1996-2001)

% Check arguments for consistency

    
function g = mlpderiv(net, x)
%MLPDERIV Evaluate derivatives of network outputs with respect to weights.
%
%	Description
%	G = MLPDERIV(NET, X) takes a network data structure NET and a matrix
%	of input vectors X and returns a three-index matrix G whose I, J, K
%	element contains the derivative of network output K with respect to
%	weight or bias parameter J for input pattern I. The ordering of the
%	weight and bias parameters is defined by MLPUNPAK.
%
%	See also
%	MLP, MLPPAK, MLPGRAD, MLPBKP
%

%	Copyright (c) Ian T Nabney (1996-2001)

% Check arguments for consistency
errstring = consist(net, 'mlp', x);
if ~isempty(errstring);
  error(errstring);
end