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I have two symmetric matrices, but of different dimensions. The entries are identified by specific labels some of which are shared by both matrices. I would like to sum the two matrices, but retain the union of the two. In other words, I want the result to be the same size as the larger of the two matrices, but with the entries that they share added together. cbind() and rbind() don't

I know one of R's advantages is it's ability to index, eliminating the need for control loops to select relevant data, so I thought this problem would be easy. I can't crack it. I have looked through past postings, but nothing seems to match this problem I have a data set with one column of actors and one column of acts. I need a list that will give me a pair of actors in each row,