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SHL 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]


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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 ] 207433 bytes


Matrix Statistics

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Size Type
663 x 663, 1712 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
1712 3 246 1463 3418
Column Data Row Data
Average nonzeros per column : 2.6
Standard deviation : 0.88

indexnonzeros
longest5 4
shortest1 1

Average nonzeros per row : 2.6
Standard deviation : 17

indexnonzeros
longest1 426
shortest4 1

Bandwidths Profile Storage
lower539 upper663
average |i-j|2.4e+02 std.dev.1.6e+02
minmaxave.std.dev.
lower bandwidth0 538 1.1e+02 2e+02
upper bandwidth0 662 2.9e+02 2.1e+02

Nonsymmetric skyline storage 263020

Heaviest diagonals
offset from main-534 188 187 185 189 182 190 183 126 140
nonzeros110 39 36 30 29 28 28 27 26 24
accumulated percent 6.43 8.7010.8112.5614.2515.8917.5219.1020.6222.02

Top 10 out of 641 nonvoid diagonals.
Conditioning
Frobenius norm9.3e+03 condition number (est.)1.9e+07
2-norm (est.)9.3e+03 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 13:33:52 US/Eastern 2004 [Comments: ]