How do I use adj2gephilab function for csv expot to gephi for network diagram representation

Hi,

Can someone help me to assist how to use the function EdgeL=adj2gephilab(filename,ADJ,parameters)

I want to export my trade date between countries and show that in a Networt in gephi. What do I have to change in this code.

My Network structure from Matlab is stored in the variable G whcih consits of two matrices, labled "G.Edges" and "G.Nodes"

the Tratding data between the countries are stored inteh matrix "p_flow_res.F5(21).M"

the file is labeled "indicators.m"

I dont know how to use this plug in. It is all stord in the same folder.

I thougt I just chagne teh first function line with my variables like this:

function EdgeL=adj2gephilab(indicators,G,p_flow_res.F5(21).M)

But I get the error liek this:

>> adj2gephilab

File: adj2gephilab.m Line: 1 Column: 52

Invalid use of operator.

How to use this plugIn, which I got from https://de.mathworks.com/matlabcentral/fileexchange/51146-adj2gephilab Fabio Vanni

Thanks

code fo file adj2gephilab.m :

function EdgeL=adj2gephilab(filename,ADJ,parameters)
% Convert ana adjacency matrix of a graph to 2 spreadhseets csv files
% one for the edge table and the other for node table.
% The files _node.csv and _edge.csv have to be open 
%in Gephi via Data Laboratory.
% INPUTS:
%           filename: string for the prefix name of the two files .csv
%           ADJ: the adjacency matrix
%           parameters: vector as properties of the node to use as
%                              attributes of them.
% OUTPUTS:
%            two csv spreadsheet files: 
%                       filename_node.csv
%                       filename_edge.csv
%             EdgeL = it returns the edge list corresponing to the
%             adjacency matrix. (it can be saved to be open in Gephi too)
%
% The two files must be open in Gephi via the Data Laboratory

nodecsv=[filename,'_node.csv'];
edgecsv=[filename,'_edge.csv'];
n=size(ADJ,1); % square adjacency matrix

if nargin<3 
    parameters=ones(n,1);% all nodes have the same attributes
end
ps=parameters;
%% Node Table:
% header for node csv
fidN = fopen(nodecsv,'w','native','UTF-8'); % best format for gephi
fprintf(fidN,'%s\n','Id;Label;Attribute');
% 
for i=2:n+1,
    fprintf(fidN,'%s\n',[ num2str(i-1) ';"Node ' num2str(i-1) '"'...
        ';' num2str(ps(i-1))]);
end
fclose(fidN);

%% Edge Table
EdgeL=conv_EdgeList(ADJ);

S=EdgeL(:,1); % sources
T=EdgeL(:,2); % targets
W = EdgeL(:,3); % weights

fidE = fopen(edgecsv,'w','native','UTF-8');
% header for edge csv
fprintf(fidE,'%s\n','Source;Target;Label;Weight');

for i=2:length(S)+1,
      fprintf(fidN,'%s\n',[ num2str(S(i-1)) ';' num2str(T(i-1)) ';'...
          '"Edge from ' num2str(S(i-1)) ' to ' num2str(T(i-1)) '"' ';'...
          num2str(W(i-1))]);
end
 fclose(fidE);

%% Aux function
function EdgeL=conv_EdgeList(adj)
% convert adj matrix to edge list
n=size(adj,1); % number of nodes
edges=find(adj>0); % indices of all edges
n_e=length(edges);
EdgeL=zeros(n_e,3);
for e=1:n_e
  [i,j]=ind2sub([n,n],edges(e)); % node indices of edge e  
  EdgeL(e,:)=[i j adj(i,j)];
end

Answer 1

[Jaynik]

Hi Peter,

The error you are getting is likely because you are trying to pass "p_flow_res.F5(21).M" as a single parameter, but MATLAB is interpreting the '.' as an operator. Instead of changing the function directly, you should pass this as a separate variable and call the function in your code.

Here is how you might modify the function call in your script:

filename = 'indicators';
ADJ = G;
parameters = p_flow_res.F5(21).M;
EdgeL = adj2gephilab(filename, ADJ, parameters); % Call to the function

Note that, "adj2gephilab" should be on the MATLAB path.

[PETER]

Hi, Thanks,

unfortunatelly the code is still not working:

____________

filename = 'indicators';

ADJ = G;

parameters = p_flow_res.F5(21).M;

EdgeL = adj2gephilab(filename, ADJ, parameters);

_____________

it gives these Errors:

________

Operator '>' is not supported for operands of type 'graph'.

Error in adj2gephilab>conv_EdgeList (line 61)

edges=find(adj>0); % indices of all edges

Error in adj2gephilab (line 40)

EdgeL=conv_EdgeList(ADJ);

Error in gephi_2st (line 4)

EdgeL = adj2gephilab(filename, ADJ, parameters);

__________

would it be acceptable for you to make a online zoom?

[Jaynik]

As per the documentation, the function "adj2gephilab" expects an adjacency matrix as input but from the error it seems that it is receiving a graph object. You can use the "adjacency" function to obtain the adjacency matrix for graph "G".

ADJ = adjacency(G);

If "G" is weighted graph, use this:

ADJ = adjacency(G, 'weighted');

Refer the following for more info on "adjacency": https://www.mathworks.com/help/matlab/ref/graph.adjacency.html