MATLAB: Computing average path length

array

I'm using karate.gml dataset, from two visualization software gephi and SocNetV both gives me an average path length of 2.408. I want to compute the average path length in matlab using the same dataset, but mine gives me 1.76. My matlab procedure is below:
I add the distance {d} returned by the shortestpath function {[P,d] = shortestpath(G,c,nodesize);} to an array I've declared and afterwards find the mean. Not sure what I'm doing wrong.
size = nodesize;
x = [];
for c = 1:size
[P,d] = shortestpath(G,c,nodesize);
x = [x, d];
end
answer = mean(x)

Best Answer

size = nodesize;
x = [];
for c = 1:size
      for dest=1:size
          if(c~=dest)
              [P,d] = shortestpath(G,c,dest);
               x = [x, d];
          end
      end
  answer = mean(x)
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