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ERIS1176: Original Harwell sparse matrix test collection
electrical network

from set SMTAPE, from the Harwell-Boeing Collection

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


Due to Erisman, summer 1973


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Visualizations

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Structure Plot
structure plot


Matrix Statistics

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Size Type
1176 x 1176, 9864 entries pattern symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
18552 1176 8688 8688 0
Column Data Row Data
Average nonzeros per column : 16
Standard deviation : 24

indexnonzeros
longest936 99
shortest2 2

Average nonzeros per row : 16
Standard deviation : 24

indexnonzeros
longest936 99
shortest2 2

Bandwidths Profile Storage
lower743 upper743
average |i-j|47 std.dev.1.1e+02
minmaxave.std.dev.
lower bandwidth0 742 76 1.6e+02
upper bandwidth0 742 76 1.6e+02

Symmetric skyline storage requirement:89685

Heaviest diagonals
offset from main0 -1 1 -2 2 -3 3 -5 5 -4
nonzeros1176 722 722 333 333 307 307 266 266 250
accumulated percent 6.3410.2314.1215.9217.7119.3721.0222.4623.8925.24

Top 10 out of 957 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: ]