How do I calculate the co-occurrence in the table? [duplicate]

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Looking at your desired output, you are looking for the crossprod function:

crossprod(table(test1))
#        product
# product p1 p2 p3 p4
#      p1  4  1  1  0
#      p2  1  3  1  0
#      p3  1  1  4  1
#      p4  0  0  1  2

This is the same as crossprod(table(test1$user, test1$product)) (reflecting Dennis’s comment).

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