
I have data in i,j,r format, 



where r is the value in location A[i,j] for some imaginary matrix A.

I need to build this matrix A, but given the sizes of i and j, I believe that using a sparse format would be most adequate.

Hopefully this will allow me to perform some basic matrix manipulation such as multiplication, addition, rowsums,  transpositions, subsetting etc etc.



Is there any way to achieve this goal in R?
Thanks,
 
Danny

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