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: retrieve_shortest_path.m
    path of file: ./repos/EEGapp/EEGapp/custom_stuff/BCT/2017_01_15_BCT
    
    the code of the file until where you have to start completion: function path = retrieve_shortest_path(s,t,hops,Pmat)
% RETRIEVE_SHORTEST_PATH        Retrieval of shortest path
%
%   This function finds the sequence of nodes that comprise the shortest
%   path between a given source and target node.
%
%   Inputs:

    
function path = retrieve_shortest_path(s,t,hops,Pmat)
% RETRIEVE_SHORTEST_PATH        Retrieval of shortest path
%
%   This function finds the sequence of nodes that comprise the shortest
%   path between a given source and target node.
%
%   Inputs:
%       s,
%           Source node: i.e. node where the shortest path begins. 
%    	t,
%           Target node: i.e. node where the shortest path end