ASH331: Original Harwell sparse matrix test collection
Scotland survey

from set SMTAPE, from the Harwell-Boeing Collection

Due to Ashkenazi, 1974.

Download as

Compressed MatrixMarket format file: ash331.mtx.gz (1454 bytes)
Compressed Harwell-Boeing format file: ash331.pra.gz (1461 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
331 x 104, 662 entries	pattern unsymmetric
Nonzeros
total diagonal below diagonal above diagonal A-A' 662 2 657 3 N/A
Column Data	Row Data
Average nonzeros per column : 6.4 Standard deviation : 1.7 index nonzeros longest 4 12 shortest 16 3	Average nonzeros per row : 2 Standard deviation : 0 index nonzeros longest 1 2 shortest 1 2
Bandwidths	Profile Storage
lower 229 upper 5 average |i-j| 1.2e+02 std.dev. 67	min max ave. std.dev. lower bandwidth 0 228 1.2e+02 66 upper bandwidth 0 4 0.021 0.25 Nonsymmetric skyline storage N/A
Heaviest diagonals
offset from main -138 -86 -18 -7 -187 -168 -117 -115 -57 -218 nonzeros 7 7 7 7 6 6 6 6 6 5 accumulated percent 1.06 2.11 3.17 4.23 5.14 6.04 6.95 7.85 8.76 9.52 Top 10 out of 232 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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Last change in this page: Wed Sep 22 13:33:53 US/Eastern 2004 [Comments: ]