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ASH292: Original Harwell sparse matrix test collection
United Kingdom survey

from set SMTAPE, from the Harwell-Boeing Collection

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


Normal matrix from least squares adjustment of survey data. 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
292 x 292, 1250 entries pattern symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
2208 292 958 958 0
Column Data Row Data
Average nonzeros per column : 7.6
Standard deviation : 1.8

indexnonzeros
longest165 14
shortest1 4

Average nonzeros per row : 7.6
Standard deviation : 1.8

indexnonzeros
longest165 14
shortest1 4

Bandwidths Profile Storage
lower25 upper25
average |i-j|8.3 std.dev.8.1
minmaxave.std.dev.
lower bandwidth0 24 14 7.6
upper bandwidth0 24 14 7.6

Symmetric skyline storage requirement:4224

Heaviest diagonals
offset from main0 -1 1 -2 2 -3 3 -19 19 -21
nonzeros292 230 230 100 100 60 60 51 51 47
accumulated percent13.2223.6434.0638.5943.1245.8348.5550.8653.1755.30

Top 10 out of 49 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 13:33:52 US/Eastern 2004 [Comments: ]