[R] List of multidimensional arrays

[pinki751]

hello,
    I want to make a two dimensional matrix from the data table.That data
table has three column 1st is userid,2nditemid and 3rd is rating
corresponding to the itemid given by userid.I want to make a m*n matrix in
which 'm' is userid and 'n' to be itemid .That 2D matrix should b filled
with that corresponding rating for that itemid for that userid. please help
me out. 



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