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BCSSTK19: BCS Structural Engineering Matrices (eigenvalue problems)
Part of a suspension bridge

from set BCSSTRUC3, from the Harwell-Boeing Collection

[Download] [Visualizations] [Matrix Statistics] [Set Information]


From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM19 from BCSSTRUC3 set.
Siffness matrix is very poorly conditioned.


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Visualizations

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Structure Plot City Plot
structure plot city plot
3D Interactive City Plot

[ VRML Version 2, gzipped ] 199128 bytes


Matrix Statistics

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Size Type
817 x 817, 3835 entries real symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
6853 817 3018 3018 0
Column Data Row Data
Average nonzeros per column : 8.4
Standard deviation : 2.3

indexnonzeros
longest4 11
shortest771 2

Average nonzeros per row : 8.4
Standard deviation : 2.3

indexnonzeros
longest4 11
shortest771 2

Bandwidths Profile Storage
lower568 upper568
average |i-j|44 std.dev.1e+02
minmaxave.std.dev.
lower bandwidth1 568 92 1.3e+02
upper bandwidth1 568 92 1.3e+02

Symmetric skyline storage requirement:74868

Heaviest diagonals
offset from main0 -3 3 -1 1 -2 2 -5 5 -4
nonzeros817 792 792 635 635 525 525 265 265 261
accumulated percent11.9223.4835.0444.3053.5761.2368.8972.7676.6280.43

Top 10 out of 469 nonvoid diagonals.
Conditioning
Frobenius norm9.6e+14 condition number (est.)2.8e+11
2-norm (est.)1.9e+14 diagonal dominanceno


Set Information

Set BCSSTRUC3
Source: John Lewis, Boeing Computer Services, Seattle, WA
Discipline:Dynamic analyses in structural engineering
Accession:Summer 1984 to spring 1985


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Last change in this page: Wed Sep 22 13:33:26 US/Eastern 2004 [Comments: ]