LPnetlib/lp_share1b
Netlib LP problem share1b: minimize c'*x, where Ax=b, lo<=x<=hi
| Name |
lp_share1b |
| Group |
LPnetlib |
| Matrix ID |
681 |
|
Num Rows
|
117 |
|
Num Cols
|
253 |
|
Nonzeros
|
1,179 |
|
Pattern Entries
|
1,179 |
|
Kind
|
Linear Programming Problem |
|
Symmetric
|
No |
|
Date
|
|
|
Author
|
M. Saunders |
|
Editor
|
D. Gay |
| Structural Rank |
117 |
| Structural Rank Full |
true |
|
Num Dmperm Blocks
|
6 |
|
Strongly Connect Components
|
1 |
|
Num Explicit Zeros
|
0 |
|
Pattern Symmetry
|
0% |
|
Numeric Symmetry
|
0% |
|
Cholesky Candidate
|
no |
|
Positive Definite
|
no |
|
Type
|
real |
| SVD Statistics |
| Matrix Norm |
2.284656e+03 |
| Minimum Singular Value |
2.185595e-02 |
| Condition Number |
1.045324e+05
|
| Rank |
117 |
| sprank(A)-rank(A) |
0 |
| Null Space Dimension |
0 |
| Full Numerical Rank? |
yes |
| Download Singular Values |
MATLAB
|
| Download |
MATLAB
Rutherford Boeing
Matrix Market
|
| Notes |
A Netlib LP problem, in lp/data. For more information
send email to netlib@ornl.gov with the message:
send index from lp
send readme from lp/data
send minos from lp/data
The following are relevant excerpts from lp/data/readme (by David M. Gay):
The column and nonzero counts in the PROBLEM SUMMARY TABLE below exclude
slack and surplus columns and the right-hand side vector, but include
the cost row. We have omitted other free rows and all but the first
right-hand side vector, as noted below. The byte count is for the
MPS compressed file; it includes a newline character at the end of each
line. These files start with a blank initial line intended to prevent
mail programs from discarding any of the data. The BR column indicates
whether a problem has bounds or ranges: B stands for "has bounds", R
for "has ranges".
The optimal value is from MINOS version 5.3 (of Sept. 1988)
running on a VAX with default options.
PROBLEM SUMMARY TABLE
Name Rows Cols Nonzeros Bytes BR Optimal Value
SHARE1B 118 225 1182 8380 -7.6589318579E+04
From Michael Saunders, Systems Optimization Laboratory at Stanford University.
The following are relevant excerts from lp/data/minos (by Michael Saunders),
regarding experience with MINOS 5.0 on the problems he provided:
(unscaled) (scaled)
File Name Rows Cols Elems Optimal Objective Itns Time Itns Time
---- -------- ---- ---- ----- ----------------- ---- ---- ---- ----
4. SHARE1B 118 225 1182 -7.6589319E+04 296 3.4 260 2.8
* Objective is the first row of type N. It is minimized except as shown.
* Itns is the number of iterations required to solve the problem
by the primal simplex method, as implemented in the Fortran
code MINOS 5.0 (May 1985), using default values for all
parameters. (The initial basis is triangular.)
* Time is the processor time required on an IBM 3081K. The MINOS
source code was compiled with the IBM Fortran 77 compiler
VS FORTRAN, using the options NOSDUMP, NOSYM and OPT(3).
|
