# x48.txt # # Discussion: # # This is simply a list of the total system size, # and the files that describe the subsystems. # # The first subsystem is a matrix A and right hand side B # whose residual norm || A * X - B || is to be minimized. # # The second subsystem is a matrix C and right hand side D # which represent constraints, that is, it must be the # case that C * X = D exactly. # # The third subsystem is a matrix E and right hand side H # which represent positivity constraints, that is, it must be the # case that E * X >= H. # # For this problem, the constraints are active. The L1 solution # is ( 3, 3 ). # # Reference: # # Helmut Spaeth, # Mathematical Algorithms for Linear Regression, # Academic Press, 1991, page 322, # ISBN 0-12-656460-4. # 4 columns 5 rows 3 subsystems x48_01.txt