=========== lp/data/kennington/readme ===========

The "Kennington" problems, sixteen problems described in "An Empirical
Evaluation of the KORBX Algorithms for Military Airlift Applications"
by W. J. Carolan, J. E. Hill, J. L. Kennington, S. Niemi, S. J.
Wichmann (Operations Research vol. 38, no. 2 (1990), pp. 240-248),
are in this directory.  They are doubly compressed, as explained
in "readme from lp/data".

Note that some people have variants of the KEN* problems in which
some of the cost coefficients are in columns 26-37 (or 26-38)
rather than columns 25-36.  Solvers that read strict MPS format
will find different solutions for these variants than for the
"correct" versions in this directory.

The following table gives some statistics for the "Kennington"
problems.  The number of columns excludes slacks and surpluses.
The bounds column tells how many entries appear in the BOUNDS
section of the MPS file.  The mpc column shows the bytes in
the problem after "uncompress" and before "emps"; MPS shows
the bytes after "emps".  The optimal values were computed by
Vanderbei's ALPO, running on an SGI computer (with binary IEEE
arithmetic).


Name       rows  columns  nonzeros  bounds      mpc      MPS     optimal value

CRE-A      3517    4067     19054        0    152726    659682   2.3595407e+07
CRE-B      9649   72447    328542        0   2119719  10478735   2.3129640e+07
CRE-C      3069    3678     16922        0    135315    587817   2.5275116e+07
CRE-D      8927   69980    312626        0   2022105   9964196   2.4454970e+07
KEN-07     2427    3602     11981     7204    150525    718748  -6.7952044e+08
KEN-11    14695   21349     70354    42698    928171   4167698  -6.9723823e+09
KEN-13    28633   42659    139834    85318   1836457   8254122  -1.0257395e+10
KEN-18   105128  154699    512719   309398   7138893  29855000  -5.2217025e+10
OSA-07     1119   23949    167643        0   1059475   5388666   5.3572252e+05
OSA-14     2338   52460    367220        0   2359656  11800249   1.1064628e+06
OSA-30     4351  100024    700160        0   4470876  22495351   2.1421399e+06
OSA-60    10281  232966   1630758        0  10377094  52402461   4.0440725e+06
PDS-02     2954    7535     21252     2134    197821    801690   2.8857862e+10
PDS-06     9882   28655     82269     9240    769564   3124272   2.7761038e+10
PDS-10    16559   48763    140063    16148   1313834   5331274   2.6727095e+10
PDS-20    33875  105728    304153    34888   2856653  11550890   2.3821659e+10


Thanks go to Irv Lustig for transmitting these problems for
distribution by netlib/ftp.