So you mean that you want the number of 1's in DG to be equal to edges?
I would say that if-condition is preventing some edges from being added, and you are assuming by looping from 1:edges that it will be satisfied every time. Your two calls to randi do not guarantee that the same edge has not already been added. You say you used a while-loop... Was it similar to the following?
while sum(DG(:)) < edges
...
end
That would guarantee the end-result that you seem to be looking for. If the loop never terminates, then there is bound to be a problem with the logic in the if, which looks more convoluted than perhaps it needs to be.
-g-
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