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 Mar 4 awarded Student Mar 4 revised Matrix Factorization problem deleted 1106 characters in body Mar 3 revised Matrix Factorization problem added 478 characters in body Mar 3 revised Matrix Factorization problem added 440 characters in body Mar 3 comment Matrix Factorization problem @Nunoxic P and Q are both 1 x k Pn denotes a specific vector P of length k ..... I don't know how to explain this better I am not a native english speaker .... but say there are n vectors of length k one of them is defined by Pn and supposed there are m vectors Q of length k one of them is defined by Qm and the dot product of Pn and Qm is a value defined by Ymn and matrix Y is the matrix of all values of Ymn where m is 1 to m and n is 1 to n ... Did I explained myself?? Mar 3 revised Matrix Factorization problem added 192 characters in body Mar 2 comment Matrix Factorization problem @Yuval Filmus No it is not a homework problem .... I was reading a research paper and they did this but I did not understand how they found the vectors thats why I posted this question. the dimensions of X are n and m where n corresponds to number of P vectors and m corresponds to number of q vectors and Ymn is the dot product of corresponding Pn and Qm(transpose). Mar 2 awarded Editor Mar 2 revised Matrix Factorization problem deleted 2 characters in body Mar 2 asked Matrix Factorization problem Jan 25 awarded Autobiographer