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: find_motif34.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 M=find_motif34(m,n)
%FIND_MOTIF34       Motif legend
%
%   Motif_matrices = find_motif34(Motif_id,Motif_class);
%   Motif_id = find_motif34(Motif_matrix);
%
%   This function returns all motif isomorphs for a given motif id and 
%   class (3 or 4). The function also returns the motif id for a given
%   motif matrix
%
%   1. Input:       Motif_id,           e.g. 1 to 13, if class is 3
%                   Motif_class,        number of nodes, 3 or 4.
%
%      Output:      Motif_matrices,     all isomorphs for the given motif
    
function returns all motif isomorphs for a given motif id and 
%   class (3 or 4). The function also returns the motif id for a given
%   motif matrix
%
%   1. Input:       Motif_id,           e.g. 1 to 13, if class is 3
%                   Motif_class,        number of nodes, 3 or 4.
%
%      Output:      Motif_matrices,     all isomorphs for the given motif
%
%   2. Input:       Motif_matrix        e.g. [0 1 0; 0 0 1; 1 0 0]
%
%      Output       Motif_id            e.g. 1 to 13, if class is 3
%
%
%Mika Rubinov, UNSW, 2007-2008

persistent M3 ID3 M4 ID4

if isscalar(m)
    if n==3
        if isempty(ID3)
            load motif34lib M3 ID3;
        end
        ind=find(ID3==m).';
        M=zeros(3,3,length(ind));
        for i=1:length(ind)
            M(:,:,i)=reshape([0 M3(ind(i),1:3) 0 ...
                M3(ind(i),4:6) 0],3,3);
        end