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ASH958: Original Harwell sparse matrix test collection
United Kingdom survey

from set SMTAPE, from the Harwell-Boeing Collection

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


Due to Ashkenazi, 1974.


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Visualizations

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Structure Plot
structure plot


Matrix Statistics

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Size Type
958 x 292, 1916 entries pattern unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
1916 2 1912 2 N/A
Column Data Row Data
Average nonzeros per column : 6.6
Standard deviation : 1.8

indexnonzeros
longest165 13
shortest1 3

Average nonzeros per row : 2
Standard deviation : 0

indexnonzeros
longest1 2
shortest1 2

Bandwidths Profile Storage
lower668 upper3
average |i-j|3.3e+02 std.dev.2e+02
minmaxave.std.dev.
lower bandwidth0 667 3.4e+02 1.9e+02
upper bandwidth0 2 0.0031 0.072

Nonsymmetric skyline storage N/A

Heaviest diagonals
offset from main-389 -426 -388 -383 -40 -577 -525 -424 -413 -375
nonzeros9 8 8 8 8 7 7 7 7 7
accumulated percent 0.47 0.89 1.30 1.72 2.14 2.51 2.87 3.24 3.60 3.97

Top 10 out of 670 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 13:33:53 US/Eastern 2004 [Comments: ]