ASH958: Original Harwell sparse matrix test collection
United Kingdom survey

from set SMTAPE, from the Harwell-Boeing Collection

Due to Ashkenazi, 1974.

Download as

Compressed MatrixMarket format file: ash958.mtx.gz (4125 bytes)
Compressed Harwell-Boeing format file: ash958.pra.gz (4050 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
958 x 292, 1916 entries	pattern unsymmetric
Nonzeros
total diagonal below diagonal above diagonal A-A' 1916 2 1912 2 N/A
Column Data	Row Data
Average nonzeros per column : 6.6 Standard deviation : 1.8 index nonzeros longest 165 13 shortest 1 3	Average nonzeros per row : 2 Standard deviation : 0 index nonzeros longest 1 2 shortest 1 2
Bandwidths	Profile Storage
lower 668 upper 3 average |i-j| 3.3e+02 std.dev. 2e+02	min max ave. std.dev. lower bandwidth 0 667 3.4e+02 1.9e+02 upper bandwidth 0 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 nonzeros 9 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.

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