The Matrix Market

Home Search Browse Resources

BP 400: 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 ] 115788 bytes


Matrix Statistics

Click on label to get an explanation.

Size Type
822 x 822, 4028 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
4028 2 1363 2663 8028
Column Data Row Data
Average nonzeros per column : 4.9
Standard deviation : 3.8

indexnonzeros
longest739 21
shortest1 1

Average nonzeros per row : 4.9
Standard deviation : 12

indexnonzeros
longest1 295
shortest2 1

Bandwidths Profile Storage
lower796 upper821
average |i-j|2.8e+02 std.dev.1.9e+02
minmaxave.std.dev.
lower bandwidth0 795 1.9e+02 1.9e+02
upper bandwidth0 820 2.5e+02 2.5e+02

Nonsymmetric skyline storage 361082

Heaviest diagonals
offset from main-181 -88 -413 -229 -465 100 320 106 -411 -327
nonzeros31 31 28 25 22 18 18 17 16 16
accumulated percent 0.77 1.54 2.23 2.86 3.40 3.85 4.29 4.72 5.11 5.51

Top 10 out of 1148 nonvoid diagonals.
Conditioning
Frobenius norm9.9e+02 condition number (est.)1.3e+07
2-norm (est.)3.1e+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: ]