BCSSTK29: BCS Structural Engineering Matrices (large eigenvalue problems)
Buckling model of a Boeing 767 rear pressure bulkhead

from set BCSSTRUC5, from the Harwell-Boeing Collection

Stiffness matrix

Download as

Compressed MatrixMarket format file: bcsstk29.mtx.gz (645888 bytes)
Compressed Harwell-Boeing format file: bcsstk29.psa.gz (266585 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
13992 x 13992, 316740 entries	pattern symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 619488 13992 302748 302748 0
Column Data	Row Data
Average nonzeros per column : 44 Standard deviation : 16 index nonzeros longest 12333 71 shortest 1819 5	Average nonzeros per row : 44 Standard deviation : 16 index nonzeros longest 12333 71 shortest 1819 5
Bandwidths	Profile Storage
lower 1158 upper 1158 average |i-j| 3.4e+02 std.dev. 3.1e+02	min max ave. std.dev. lower bandwidth 0 1157 5.3e+02 2.4e+02 upper bandwidth 0 1157 5.3e+02 2.4e+02 Symmetric skyline storage requirement:7441166
Heaviest diagonals
offset from main 0 -1 1 -2 2 -3 3 -4 4 -5 nonzeros 13992 12530 12530 11146 11146 8464 8464 8405 8405 7373 accumulated percent 2.26 4.28 6.30 8.10 9.90 11.27 12.63 13.99 15.35 16.54 Top 10 out of 2315 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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Last change in this page: Wed Sep 22 13:33:28 US/Eastern 2004 [Comments: ]