Matrix JGL009

JGL009: Small counter example matrices

from set COUNTERX, from the Harwell-Boeing Collection

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

Download as

Compressed MatrixMarket format file: jgl009.mtx.gz (179 bytes)

Compressed Harwell-Boeing format file: jgl009.pua.gz (198 bytes)

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Visualizations

Click on image to get an enlarged version. Click on label to get an explanation.

Structure Plot

Size Type

9 x 9, 50 entries pattern unsymmetric

Nonzeros

total diagonal below diagonal above diagonal A-A'
50 8 31 11 44

Column Data Row Data

Average nonzeros per column : 5.6
Standard deviation : 1.9
index nonzeros
longest 1 8
shortest 8 2
Average nonzeros per row : 5.6
Standard deviation : 2.1
index nonzeros
longest 8 9
shortest 1 3

Bandwidths Profile Storage

lower 9 upper 9
average |i-j| 2.9 std.dev. 2.4

min max ave. std.dev.
lower bandwidth 1 9 4.9 2.8
upper bandwidth 1 9 3 3
Symmetric skyline storage requirement:62

Heaviest diagonals

offset from main -1 0 -3 -2 -4 1 -6 -5 -7 6
nonzeros 8 8 5 5 4 4 3 3 2 2
accumulated percent 16.00 32.00 42.00 52.00 60.00 68.00 74.00 80.00 84.00 88.00

Top 10 out of 16 nonvoid diagonals.

Conditioning

Pattern matrix. No conditioning information.

Set Information

Set COUNTERX
Source:	John Lewis, Boeing Computer Services, Seattle, Washington.
Discipline:	Simple counter examples to Hellerman and Rarick algorithm
Accession:	Summer 1983

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Last change in this page: Wed Sep 22 13:33:33 US/Eastern 2004 [Comments: ]