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coinvestments
2011 Apr 03
0
Avoiding loops in creating a coinvestment matrix
Hi, I am working on a dataset in which a number of venture capitalists invest
in a number of firms. What I am creating is an asymmetric matrix M in which
m(ij) is the volume (sum) of coinvestments of VC i with VC j (i.e., how much
has VC i invested in companies that VC j also has investments in). The
output should look like the "coinvestments" matrix produced with the code
below. If possible I would like to avoid loops and optimize the code for
speed because the real data is huge....