IBM32: Original Harwell sparse matrix test collection
1971 IBM conference advertisement

from set SMTAPE, from the Harwell-Boeing Collection

Download as

Compressed MatrixMarket format file: ibm32.mtx.gz (358 bytes)
Compressed Harwell-Boeing format file: ibm32.pua.gz (401 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
32 x 32, 126 entries	pattern unsymmetric
Nonzeros
total diagonal below diagonal above diagonal A-A' 126 32 45 49 172
Column Data	Row Data
Average nonzeros per column : 3.9 Standard deviation : 1.4 index nonzeros longest 9 7 shortest 13 2	Average nonzeros per row : 3.9 Standard deviation : 1.4 index nonzeros longest 3 8 shortest 19 2
Bandwidths	Profile Storage
lower 27 upper 27 average |i-j| 7.3 std.dev. 7.5	min max ave. std.dev. lower bandwidth 0 26 9.7 8.1 upper bandwidth 0 26 11 7.2 Nonsymmetric skyline storage 623
Heaviest diagonals
offset from main 0 1 2 -7 -1 4 12 13 18 -18 nonzeros 32 6 5 4 4 4 4 4 4 3 accumulated percent 25.40 30.16 34.13 37.30 40.48 43.65 46.83 50.00 53.17 55.56 Top 10 out of 43 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:33:51 US/Eastern 2004 [Comments: ]