Group LPnetlib

Group Description
NETLIB Linear Programming problems, www.netlib.org.

matrices/LPnetlib/README.  Tim Davis, May 15, 1997. (davis :at the domain:
cise.ufl.edu)

The files in this directory are a translation of the linear programming
problems in Netlib.  You can obtain more information about the Netlib LP
problems by sending email to netlib :at the domain:
ornl.gov with the message
"send index from lp".


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
NOTICE!  The Netlib LP problems, in MPS format, should be considered the
"canonical" problems.  If you find any problems with different optimal
objectives than what is reported in Netlib, then please let me know.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

The Netlib LP problems are in MPS or compressed MPS format.  Any compressed
MPS files were uncompressed using emps.c in the Netlib lp/data directory.
The MPS files were then converted to the KAR format using the mpsrd program
by M.G.C. Resende and G. Veiga.  The mpsrd program does not process RANGES,
so five problems (boeing1, boeing2, forplan, nesm, and seba) do not appear
here.  The KAR format is written out by mpsrd as follows:

c     name   - problem name (same as mps name card)
      write(out,'(a8)') name
c     m      - number or rows (input)
c     n      - number of columns (input)
      write(out,*) m,n
c     ia     - pointers to the begining of storage of column
      write(out,*) (ia(i),i=1,n+1)
c     ja     - row indices for each non zero entry (input)
      write(out,*) (ja(i),i=1,ia(n+1)-1)
c     a      - non zero entries (input)
      write(out,*) (a(i),i=1,ia(n+1)-1)
c     b      - right hand side (input)
      write(out,*) (b(i),i=1,m)
c     c      - objective vector (minimize)
      write(out,*) (c(i),i=1,n)
c     z0     - initial fixed value for objective
      write(out,*) z0
c     lobnd  - lower bounds on variables
      write(out,*) (lobnd(i),i=1,n)
c     upbnd  - upper bounds on variables
      write(out,*) (upbnd(i),i=1,n)

Mpsrd converts the MPS problem into a single form:

	minimize c'*x, subject to Ax=b and l<=x<=u.
	(and given an initial value of the objective, z0).

Next, the KAR formatted version of the LP problem was converted into
two formats by the readkar.f program, written by Tim Davis.  It generates
a single Matlab script, such as lp_afiro.m for the AFIRO problem.
For infeasible (lp/infeas) problems, the prefix is lpi_ (lpi_galenet.m for
the problem GALENET, for example).  This prefix was chosen so that you
are sure to notice that the problem is infeasible, and also because there
are two versions of the same problem in Netlib (GREENBEA), one feasible
and the other not.



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The *.clu files contain the c, l, and u vectors,
and the scalar z0, for the LP problems held in
RRA format in the LPnetlib directory.  The dense vectors
appear in order: c, l, u, and then z0.  One entry is held
on each line. 

The RRA files contain A and b, in Harwell/Boeing format.

The LP problems are all of the form

	minimize c'*x, subject to Ax=b and l<=x<=u
	and where z0 is the initial value of the
	objective.
Displaying collection matrices 101 - 120 of 138 in total
Id Name Group Rows Cols Nonzeros Kind Date Download File
694 lp_standmps LPnetlib 467 1,274 3,878 Linear Programming Problem 1989 MATLAB Rutherford Boeing Matrix Market
695 lp_stocfor1 LPnetlib 117 165 501 Linear Programming Problem 1988 MATLAB Rutherford Boeing Matrix Market
696 lp_stocfor2 LPnetlib 2,157 3,045 9,357 Linear Programming Problem 1988 MATLAB Rutherford Boeing Matrix Market
697 lp_stocfor3 LPnetlib 16,675 23,541 72,721 Linear Programming Problem 1989 MATLAB Rutherford Boeing Matrix Market
698 lp_truss LPnetlib 1,000 8,806 27,836 Linear Programming Problem 1990 MATLAB Rutherford Boeing Matrix Market
699 lp_tuff LPnetlib 333 628 4,561 Linear Programming Problem 1989 MATLAB Rutherford Boeing Matrix Market
700 lp_vtp_base LPnetlib 198 346 1,051 Linear Programming Problem MATLAB Rutherford Boeing Matrix Market
701 lp_wood1p LPnetlib 244 2,595 70,216 Linear Programming Problem 1989 MATLAB Rutherford Boeing Matrix Market
702 lp_woodw LPnetlib 1,098 8,418 37,487 Linear Programming Problem MATLAB Rutherford Boeing Matrix Market
703 lpi_bgdbg1 LPnetlib 348 629 1,662 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
704 lpi_bgetam LPnetlib 400 816 2,537 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
705 lpi_bgindy LPnetlib 2,671 10,880 66,266 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
706 lpi_bgprtr LPnetlib 20 40 70 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
707 lpi_box1 LPnetlib 231 261 651 Linear Programming Problem 1992 MATLAB Rutherford Boeing Matrix Market
708 lpi_ceria3d LPnetlib 3,576 4,400 21,178 Linear Programming Problem MATLAB Rutherford Boeing Matrix Market
709 lpi_chemcom LPnetlib 288 744 1,590 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
710 lpi_cplex1 LPnetlib 3,005 5,224 10,947 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
711 lpi_cplex2 LPnetlib 224 378 1,215 Linear Programming Problem 1993 MATLAB Rutherford Boeing Matrix Market
712 lpi_ex72a LPnetlib 197 215 467 Linear Programming Problem 1992 MATLAB Rutherford Boeing Matrix Market
713 lpi_ex73a LPnetlib 193 211 457 Linear Programming Problem 1992 MATLAB Rutherford Boeing Matrix Market