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...of the first row for each person from the original matrices, the second contains the second row for each person from the original matrices etc etc up to the mth new set containing the mth row from the original matrices for each person. Say the original matrix for each person can be indexed by xfinal.list[[i]] I want to extract for each person in turn, the jth row, i.e. xfinal.list[[i]][j,] then bind these n vectors into a new matrix. I am a little confused as to how I can index the jth row from the ith person, obviously I will need a loop I thought I would be able to use something like:...