Matrix JGL011

JGL011: Small counter example matrices

from set COUNTERX, from the Harwell-Boeing Collection

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

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Compressed MatrixMarket format file: jgl011.mtx.gz (232 bytes)

Compressed Harwell-Boeing format file: jgl011.pua.gz (217 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

11 x 11, 76 entries pattern unsymmetric

Nonzeros

total diagonal below diagonal above diagonal A-A'
76 10 48 18 64

Column Data Row Data

Average nonzeros per column : 6.9
Standard deviation : 2.6
index nonzeros
longest 2 10
shortest 9 3
Average nonzeros per row : 6.9
Standard deviation : 2.9
index nonzeros
longest 9 11
shortest 1 4

Bandwidths Profile Storage

lower 11 upper 11
average |i-j| 3.6 std.dev. 3

min max ave. std.dev.
lower bandwidth 1 11 5.4 3.6
upper bandwidth 1 11 3.6 3.8
Symmetric skyline storage requirement:88

Heaviest diagonals

offset from main 0 -1 -2 -3 -4 -5 1 -6 -8 -7
nonzeros 10 9 8 7 6 5 5 4 3 3
accumulated percent 13.16 25.00 35.53 44.74 52.63 59.21 65.79 71.05 75.00 78.95

Top 10 out of 19 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: ]