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: somunpak.m
    path of file: ./repos/bnt/netlab3.3
    
    the code of the file until where you have to start completion: function net = somunpak(net, w)
%SOMUNPAK Replaces node weights in SOM.
%
%	Description
%	NET = SOMUNPAK(NET, W) takes a SOM data structure NET and weight
%	matrix W (each node represented by a row) and puts the nodes back
%	into the multi-dimensional array NET.MAP.
%
%	The ordering of the parameters in W is defined by the indexing of the
%	multi-dimensional array NET.MAP.
%
%	See also
%	SOM, SOMPAK

    
function net = somunpak(net, w)
%SOMUNPAK Replaces node weights in SOM.
%
%	Description
%	NET = SOMUNPAK(NET, W) takes a SOM data structure NET and weight
%	matrix W (each node represented by a row) and puts the nodes back
%	into the multi-dimensional array NET.MAP.
%
%	The ordering of the parameters in W is defined by the indexing of the
%	multi-dimensional array NET.MAP.
%
%	See also
%	SOM, SOMPAK
%

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

errstring = consist(net, 'som');
if ~isempty(errstring)
    error(errstring);
end