To clarify, the two matrices might look like this:
A B C D E F
A 1 2 3 4 5 6
B 2 4 6 8 10 12
C 0 0 0 0 0 0
D 0 1 0 1 0 1
E 3 6 9 11 13 15
F 2 2 2 2 2 2
B D E
B 4 9 13
D 9 8 7
E 1 0 1
I would like this:
A B C D E
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
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 act
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