ASH85: Original Harwell sparse matrix test collection
Holland survey

from set SMTAPE, from the Harwell-Boeing Collection

Normal matrix from least squares adjustment of survey data. Due to Ashkenazi, 1974.

Download as

Compressed MatrixMarket format file: ash85.mtx.gz (636 bytes)
Compressed Harwell-Boeing format file: ash85.psa.gz (734 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
85 x 85, 304 entries	pattern symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 523 85 219 219 0
Column Data	Row Data
Average nonzeros per column : 6.2 Standard deviation : 1.4 index nonzeros longest 39 10 shortest 63 3	Average nonzeros per row : 6.2 Standard deviation : 1.4 index nonzeros longest 39 10 shortest 63 3
Bandwidths	Profile Storage
lower 40 upper 40 average |i-j| 8.3 std.dev. 10	min max ave. std.dev. lower bandwidth 0 39 14 11 upper bandwidth 0 39 14 11 Symmetric skyline storage requirement:1153
Heaviest diagonals
offset from main 0 -1 1 -2 2 -10 10 -11 11 -8 nonzeros 85 73 73 17 17 14 14 12 12 11 accumulated percent 16.25 30.21 44.17 47.42 50.67 53.35 56.02 58.32 60.61 62.72 Top 10 out of 67 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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Last change in this page: Wed Sep 22 13:33:52 US/Eastern 2004 [Comments: ]