How to modify data in MatLab code to be csv file

I have this following graph.

Currently, it works using this following data in MatLab code

function [] =  TestKShortestPath(case_number)
switch case_number
    case 1
        netCostMatrix = [inf 1 inf 1 ; 1 inf 1 1 ;inf 1 inf inf ;inf inf inf inf ];
        source=3;
        destination=4;
        k = 5; 
            otherwise
        error('The only case options available are 1, 2 or 3');
end
fprintf('You selected case #%d, a %dx%d network:\n',case_number,size(netCostMatrix,1),size(netCostMatrix,1));
disp(netCostMatrix);
fprintf('The path request is from source node %d to destination node %d, with K = %d \n',source,destination, k);
[shortestPaths, totalCosts] = kShortestPath(netCostMatrix, source, destination, k);

fprintf('\nResult of Function call: kShortestPath(netCostMatrix, source, destination, k)  = \n\n');

if isempty(shortestPaths)
    fprintf('No path available between these nodes\n\n');
else
    for i = 1: length(shortestPaths)
        fprintf('Path # %d:\n',i);
        disp(shortestPaths{i})
        fprintf('Cost of path %d is %5.2f\n\n',i,totalCosts(i));
    end
end
end

My problem is, I want to change the data to be input file (.csv), to do so how to modify the above code (especially line 4-7)? Here I have my data file (attached, exampleGraph.csv, that is the same like the above data, case 1). thank you very much