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BP 1200: Original Harwell sparse matrix test collection
Simplex method basis matrix

from set SMTAPE, from the Harwell-Boeing Collection

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


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Visualizations

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

[ VRML Version 2, gzipped ] 146623 bytes


Matrix Statistics

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Size Type
822 x 822, 4726 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
4726 6 1880 2840 9394
Column Data Row Data
Average nonzeros per column : 5.7
Standard deviation : 4.1

indexnonzeros
longest739 21
shortest1 1

Average nonzeros per row : 5.7
Standard deviation : 12

indexnonzeros
longest1 311
shortest2 1

Bandwidths Profile Storage
lower805 upper821
average |i-j|2.9e+02 std.dev.1.9e+02
minmaxave.std.dev.
lower bandwidth0 804 2.3e+02 2.1e+02
upper bandwidth0 820 2.5e+02 2.5e+02

Nonsymmetric skyline storage 392600

Heaviest diagonals
offset from main-229 -181 -88 -327 -329 320 -413 100 -411 184
nonzeros25 22 21 19 17 17 16 16 15 15
accumulated percent 0.53 0.99 1.44 1.84 2.20 2.56 2.90 3.24 3.55 3.87

Top 10 out of 1293 nonvoid diagonals.
Conditioning
Frobenius norm1.2e+03 condition number (est.)3.5e+08
2-norm (est.)4e+02 diagonal dominanceno


Set Information

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


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Last change in this page: Wed Sep 22 13:33:53 US/Eastern 2004 [Comments: ]