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BCSSTK22: BCS Structural Engineering Matrices (eigenvalue problems)
Textile loom frame

from set BCSSTRUC3, from the Harwell-Boeing Collection

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From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM22 from BCSSTRUC3 set.
Siffness matrix is very poorly conditioned.


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Visualizations

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Structure Plot City Plot
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3D Interactive City Plot

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Matrix Statistics

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Size Type
138 x 138, 417 entries real symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
696 138 279 279 0
Column Data Row Data
Average nonzeros per column : 5
Standard deviation : 1.9

indexnonzeros
longest68 8
shortest2 2

Average nonzeros per row : 5
Standard deviation : 1.9

indexnonzeros
longest68 8
shortest2 2

Bandwidths Profile Storage
lower112 upper112
average |i-j|9.1 std.dev.19
minmaxave.std.dev.
lower bandwidth1 112 16 25
upper bandwidth1 112 16 25

Symmetric skyline storage requirement:2262

Heaviest diagonals
offset from main0 -3 3 -2 2 -1 1 -4 4 -24
nonzeros138 87 87 52 52 45 45 32 32 24
accumulated percent19.8332.3344.8352.3059.7766.2472.7077.3081.9085.34

Top 10 out of 65 nonvoid diagonals.
Conditioning
Frobenius norm2.1e+07 condition number (est.)1.7e+05
2-norm (est.)5.9e+06 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: ]