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STR 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 ] 301156 bytes


Matrix Statistics

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Size Type
363 x 363, 2454 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
2454 2 744 1708 4892
Column Data Row Data
Average nonzeros per column : 6.8
Standard deviation : 8.7

indexnonzeros
longest236 34
shortest1 1

Average nonzeros per row : 6.8
Standard deviation : 7.4

indexnonzeros
longest14 34
shortest2 1

Bandwidths Profile Storage
lower207 upper360
average |i-j|1.6e+02 std.dev.94
minmaxave.std.dev.
lower bandwidth0 206 58 66
upper bandwidth0 359 75 1.1e+02

Nonsymmetric skyline storage 47820

Heaviest diagonals
offset from main-33 193 156 -66 -100 -51 -35 118 188 225
nonzeros29 28 27 21 20 19 19 19 18 18
accumulated percent 1.18 2.32 3.42 4.28 5.09 5.87 6.64 7.42 8.15 8.88

Top 10 out of 424 nonvoid diagonals.
Conditioning
Frobenius norm32 condition number (est.)7.6e+02
2-norm (est.)14 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: ]