Question: Do these subroutines multiply Ax by rows or columns? Start with B(I) = 0: DO 10 I = 1, N DO 10 J = 1,

Do these subroutines multiply Ax by rows or columns? Start with

Do these subroutines multiply Ax by rows or columns? Start with B(I) = 0: DO 10 I = 1, N DO 10 J = 1, N DO 10 J = 1, N Do 10 I = 1, N B(I) = B(I) + A(I, J) * X(J) B(I) = B(I) +A (I, J) X (J) The outputs Bx = Ax are the same. The second code is slightly more efficient in FORTRAN and much more efficient on a vector machine (the first changes single entries B(I), the second can update whole vectors)

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