ERIS1176: Original Harwell sparse matrix test collection
electrical network

from set SMTAPE, from the Harwell-Boeing Collection

Due to Erisman, summer 1973

Download as

Compressed MatrixMarket format file: eris1176.mtx.gz (24157 bytes)
Compressed Harwell-Boeing format file: eris1176.psa.gz (8981 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
1176 x 1176, 9864 entries	pattern symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 18552 1176 8688 8688 0
Column Data	Row Data
Average nonzeros per column : 16 Standard deviation : 24 index nonzeros longest 936 99 shortest 2 2	Average nonzeros per row : 16 Standard deviation : 24 index nonzeros longest 936 99 shortest 2 2
Bandwidths	Profile Storage
lower 743 upper 743 average |i-j| 47 std.dev. 1.1e+02	min max ave. std.dev. lower bandwidth 0 742 76 1.6e+02 upper bandwidth 0 742 76 1.6e+02 Symmetric skyline storage requirement:89685
Heaviest diagonals
offset from main 0 -1 1 -2 2 -3 3 -5 5 -4 nonzeros 1176 722 722 333 333 307 307 266 266 250 accumulated percent 6.34 10.23 14.12 15.92 17.71 19.37 21.02 22.46 23.89 25.24 Top 10 out of 957 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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