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4 Problem 2 : Matrix Diagonal Sums 4 . 1 Overview A problem that occasionally arises in numerical computing when working with Matrices ( 2
Problem : Matrix Diagonal Sums
Overview
A problem that occasionally arises in numerical computing when working with Matrices D Arrays is to compute the sums of the Diagonals of a matrix. The main diagonal of a matrix is comprised of all elements at indices and so forth. There are several numbering schemes for diagonals but we will use the one represented in the following diagram which also shows the sums of the diagonal
A code is provided in the file sumdiagbase.c which computes the sums of diagonals and stores them in a vector. The algorithm does so using the most "natural" approach of walking down each diagonal and totaling its elements then storing the result in the associated vector element. As you survey the code, note the use of various convenience functions such as mgetmatij and vsetvecix to interact with the matrix and vector types used.
int sumdiagBASENORMALmatrixt mat, vectort vec
ifveclen matrows mat.cols
printfsumdiagbase: bad sizes
;
return ;
forint i; i
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