Your comment makes no sense.....? All of the needed information is included. I am not sure what you are talking about when you say "All Calculation of matrix".

21. Show how checksums can be used to detect and correct errors in a scalar by matrix multiplication for the following example. Assume a 3 x 3 matrix: 1 2 31 A-4 5 6 Show the corresponding column-weighted matrix Ac and assume that during the multiplication of Ac by the scalar 2 a single error has occurred resulting in the following output 2. A-8 10 12 14 17 18 21. Show how checksums can be used to detect and correct errors in a scalar by matrix multiplication for the following example. Assume a 3 x 3 matrix: 1 2 31 A-4 5 6 Show the corresponding column-weighted matrix Ac and assume that during the multiplication of Ac by the scalar 2 a single error has occurred resulting in the following output 2. A-8 10 12 14 17 18