LPnetlib/lp_truss
Netlib LP problem truss: minimize c'*x, where Ax=b, lo<=x<=hi
| Name |
lp_truss |
| Group |
LPnetlib |
| Matrix ID |
698 |
|
Num Rows
|
1,000 |
|
Num Cols
|
8,806 |
|
Nonzeros
|
27,836 |
|
Pattern Entries
|
27,836 |
|
Kind
|
Linear Programming Problem |
|
Symmetric
|
No |
|
Date
|
1990 |
|
Author
|
M. Ferris |
|
Editor
|
D. Gay |
| Structural Rank |
1,000 |
| Structural Rank Full |
true |
|
Num Dmperm Blocks
|
1 |
|
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 |
5.603150e+00 |
| Minimum Singular Value |
1.174310e-02 |
| Condition Number |
4.771439e+02
|
| Rank |
1,000 |
| 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, from a generator in lp/data. For more information
send email to netlib@ornl.gov with the message:
send index from lp
send readme from lp/data
This copy of TRUSS was created by the TRUSS generator program,
on an Sun UltraSparc, on May 15, 1997.
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
TRUSS 1001 8806 36642 (see NOTES) 4.5881584719E+05
Source: At the request of Olvi Mangasarian, Rudy Setiono supplied the
generator and description (both written by Michael Ferris) and data for TRUSS.
Requesting TRUSS will get you a bundle of Fortran source and data for
generating an MPS file for TRUSS, a problem of minimizing the weight
of a certain structure. The bundle also includes a description of the
problem.
Added to Netlib on 26 Feb. 1990
|
