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...rices of 100 to 1,000,000 rows/columns. Our R prototype script uses spase base matrices and the methods qr() and qr.coeff(). The following statements are called inside a doubly-nested loop: G is an n x m sparse matrix with most nonzero values near the main diagonal, CURR is an n x 1 vector: the MATALAB script: P = G \ CURR; % matrix left-divide QG = qr(G) P = qr.coef(QG, CURR) The answer we get matches that of the MATLAB code for small (60x60) problems. But, execution times are much longer (40 minutes, compared to 2 minut...