# x49.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.
#
# The L1 solution is ( 1, 1/2 ).
#
# Reference:
#
# Helmut Spaeth,
# Mathematical Algorithms for Linear Regression,
# Academic Press, 1991, page 322,
# ISBN 0-12-656460-4.
#
4 columns
4 rows
3 subsystems
x49_01.txt