# x44_01.txt # # Reference: # # Helmut Spaeth, # Mathematical Algorithms for Linear Regression, # Academic Press, 1991, page 190, # ISBN 0-12-656460-4. # # Discussion: # # Subsystem (a) of the linear system A * X = B. # 4 columns 4 rows Index A1 A2 B 1 1 1 2 2 3 1 5 3 6 1 6 4 8 1 6