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SHL 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]


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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 ] 203012 bytes


Matrix Statistics

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Size Type
663 x 663, 1687 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
1687 5 189 1493 3364
Column Data Row Data
Average nonzeros per column : 2.5
Standard deviation : 0.91

indexnonzeros
longest132 4
shortest1 1

Average nonzeros per row : 2.5
Standard deviation : 17

indexnonzeros
longest1 422
shortest4 1

Bandwidths Profile Storage
lower535 upper662
average |i-j|2.5e+02 std.dev.1.6e+02
minmaxave.std.dev.
lower bandwidth0 534 1e+02 2.1e+02
upper bandwidth0 661 2.9e+02 2.1e+02

Nonsymmetric skyline storage 261577

Heaviest diagonals
offset from main-534 188 187 182 189 190 185 183 186 126
nonzeros126 44 40 33 33 32 31 28 28 25
accumulated percent 7.4710.0812.4514.4016.3618.2620.0921.7523.4124.90

Top 10 out of 566 nonvoid diagonals.
Conditioning
Frobenius norm9.6e+03 condition number (est.)2.2e+07
2-norm (est.)9.6e+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: ]