CEGB3306: Structural engineering matrices (unassembled)
Framework problem essentially in two dimensions

from set CEGB, from the Harwell-Boeing Collection

Note: The previously available version of this matrix in Matrix Market format refects an assembly which differs from what the contributor intended and has been withdrawn. Please discard it if you have taken a copy. The Harwell-Boeing file remains, but requires proper interpretation.

Download as

Matrix Market format not available.
Compressed Harwell-Boeing format file: cegb3306.pse.gz (13446 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
3306 x 3306, 9378 entries	pattern symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 74916 3222 35847 35847 0
Column Data	Row Data
Average nonzeros per column : 23 Standard deviation : 11 index nonzeros longest 571 54 shortest 211 0	Average nonzeros per row : 23 Standard deviation : 11 index nonzeros longest 571 54 shortest 211 0
Bandwidths	Profile Storage
lower 468 upper 468 average |i-j| 1.5e+02 std.dev. 1.6e+02	min max ave. std.dev. lower bandwidth 0 467 1.1e+02 1.5e+02 upper bandwidth 0 467 1.1e+02 1.5e+02 Symmetric skyline storage requirement:356967
Heaviest diagonals
offset from main 0 -1 1 -2 2 -3 3 -4 4 -5 nonzeros 3222 2822 2822 2422 2422 2022 2022 1622 1622 1222 accumulated percent 4.30 8.07 11.83 15.07 18.30 21.00 23.70 25.86 28.03 29.66 Top 10 out of 935 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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Last change in this page: Wed Sep 22 13:33:30 US/Eastern 2004 [Comments: ]