The Matrix Market

Home Search Browse Resources

BP 0: Original Harwell sparse matrix test collection
Simplex method basis matrix

from set SMTAPE, from the Harwell-Boeing Collection

[Download] [Visualizations] [Matrix Statistics] [Set Information]


Download as

Help: My browser can't read the compressed data files. What now?


Visualizations

Click on image to get an enlarged version. Click on label to get an explanation.

Structure Plot City Plot
structure plot city plot
3D Interactive City Plot

[ VRML Version 2, gzipped ] 410144 bytes


Matrix Statistics

Click on label to get an explanation.

Size Type
822 x 822, 3276 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
3276 1 793 2482 6516
Column Data Row Data
Average nonzeros per column : 4
Standard deviation : 3.2

indexnonzeros
longest723 20
shortest1 1

Average nonzeros per row : 4
Standard deviation : 11

indexnonzeros
longest1 266
shortest2 1

Bandwidths Profile Storage
lower517 upper821
average |i-j|2.9e+02 std.dev.2e+02
minmaxave.std.dev.
lower bandwidth0 516 1.3e+02 1.6e+02
upper bandwidth0 820 2.5e+02 2.6e+02

Nonsymmetric skyline storage 311507

Heaviest diagonals
offset from main-88 -181 -413 -229 -465 -327 320 100 106 105
nonzeros41 37 34 30 25 24 20 18 18 17
accumulated percent 1.25 2.38 3.42 4.33 5.10 5.83 6.44 6.99 7.54 8.06

Top 10 out of 898 nonvoid diagonals.
Conditioning
Frobenius norm9.8e+02 condition number (est.)2e+07
2-norm (est.)4e+02 diagonal dominanceno


Set Information

Set SMTAPE
Source: Harwell Laboratory, England.
Discipline:Variety of disciplines
Accession:Summer 1978


The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:33:52 US/Eastern 2004 [Comments: ]