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Re: multiplying matrice rows



m = {{1, 2, 3}, {1, 2, 3}, {1, 2, 3}};
amatrix = {{a, b, c},
        {a, b, c},
       {a, b, c}}

MapAt[Dot[amatrix, #] &, m, {2}]

with correct postions in MapAt[] does not help?


Dragutin Culinovic wrote:
> How can I to multiply enumerated list of rows of an matrice on following
> way:
> To multyply each row (except rows a,b and c)of matrice A withe row a of
> the same matrice, and replace that row (not a row) with result.
> rows b and c are last rows, row a is any row in the range 1->b(exclusive)

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