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It is not of very good practice to use variable names that depend on indices. And in practice this is hard to manipulate. You can alternatively do sage: O, t = A.gram_schmidt() sage: w = O.rows() sage: w[0] -> the first row sage: w[1] -> the second row

But since you have the function O.row available I do not see why you need to make variables out of it.

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No.2 Revision

It is not of very good practice to use variable names that depend on indices. And in practice this is hard to manipulate. You can alternatively do do

sage: O, t =  A.gram_schmidt()
 sage: w = O.rows()
 sage: w[0]
 -> the first row
  sage: w[1]
  -> the second row

row

But since you have the function O.row available I do not see why you need to make variables out of it.

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No.3 Revision

It is not of very good practice to use variable names that depend on indices. And in practice this is hard to manipulate. You can alternatively do

sage: O, t =  A.gram_schmidt()
sage: w = O.rows()
sage: w[0]
-> the first row
 sage: w[1]
 -> the second row

But since you have the function O.row available I do not see why you need to make variables out of it.