Fill matrix from data frame
I have a data frame which contains some data (Claims) and two additional
columns, containing row and column information, for example:
Claim row Column
5000 2 10
etc.
I have a matrix that contains some data as well as NAs. I'd like to
replace the NAs with the data from the data frame, using the row/column
information. So 5000 would replace the NA in the matrix that is currently
in row 2, column 10.
Is there an easy way to accomplish this with R?
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