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: GCO_SetLabelCost.m
    path of file: ./repos/microshift_compression/verilog code/matlab_files/Toolkits/gco-v3.0/matlab
    
    the code of the file until where you have to start completion: function GCO_SetLabelCost(Handle,LabelCost,LabelSubset)
% GCO_SetLabelCost   Set costs associated with using labels.

    
function GCO_SetLabelCost(Handle,LabelCost,LabelSubset)
% GCO_SetLabelCost   Set costs associated with using labels.
%    GCO_SetLabelCost(Handle,LabelCost) with scalar LabelCost gives the
%    same cost to all labels.
%    GCO_SetLabelCost(Handle,LabelCost) with 1xNumLabels LabelCost
%    associates cost LabelCost(k) to label k.
%    GCO_SetLabelCost(Handle,LabelCost,LabelSubset) sets the cost for using
%    at least one label mentioned in LabelSubset (i.e. LabelSubset is a 
%    vector containing label indices). The cost is paid once.
%    SetLabelCost can be called before or after Expansion.

GCO_LoadLib();
if (nargin < 2)
    error('Expected at least 2 arguments');
end
NumLabels = gco_matlab('gco_getnumlabels',Handle);
if (length(LabelCost) ~= 1 && length(LabelCost) ~= NumLabels)
    error('LabelCost must be scalar or of length NumLabels');
end