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WILL199: Original Harwell sparse matrix test collection
stress-analysis

from set SMTAPE, from the Harwell-Boeing Collection

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


Given by Willoughby in Reid, 1970.


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Visualizations

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Structure Plot
structure plot


Matrix Statistics

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Size Type
199 x 199, 701 entries pattern unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
701 22 337 342 1282
Column Data Row Data
Average nonzeros per column : 3.5
Standard deviation : 1.6

indexnonzeros
longest5 9
shortest46 2

Average nonzeros per row : 3.5
Standard deviation : 0.88

indexnonzeros
longest199 6
shortest184 1

Bandwidths Profile Storage
lower170 upper151
average |i-j|73 std.dev.44
minmaxave.std.dev.
lower bandwidth0 169 72 60
upper bandwidth0 150 53 43

Nonsymmetric skyline storage 24698

Heaviest diagonals
offset from main0 -60 -59 -30 -90 -66 -67 46 49 -80
nonzeros22 20 20 16 15 11 10 8 8 7
accumulated percent 3.14 5.99 8.8411.1313.2714.8416.2617.4018.5419.54

Top 10 out of 205 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.


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 13:33:51 US/Eastern 2004 [Comments: ]