#  x30.txt
#
#  Reference:
#
#    Helmut Spaeth,
#    Mathematical Algorithms for Linear Regression,
#    Academic Press, 1991,
#    ISBN 0-12-656460-4.
#
#  Discussion:
#
#    A 4 by 3 linear system is considered.
#
#    There are 4 rows of data.  The data includes:
#
#      I,  the index;
#      A1, column 1;
#      A2, column 2;
#      A3, column 3;
#      B,  the right hand side.
#
#    We seek a model of the form:
#
#      B = A1 * X1 + A2 * X2 + A3 * X3
#
#    The normal equations method is expected to fail on this case.
#
5 columns
4 rows
Index
A1
A2
A3
B
 1  1.000000  1.000000  1.000000  1.000000
 2  0.000001  0.000000  0.000000  0.000000
 3  0.000000  0.000001  0.000000  0.000000
 4  0.000000  0.000000  0.000001  0.000000