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BCSSTK01: BCS Structural Engineering Matrices (eigenvalue matrices)
Small test problem

from set BCSSTRUC1, 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 BCSSTM01 from BCSSTRUC1 set.


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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 ] 57579 bytes


Matrix Statistics

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Size Type
48 x 48, 224 entries real symmetric positive definite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
400 48 176 176 0
Column Data Row Data
Average nonzeros per column : 8.3
Standard deviation : 1.6

indexnonzeros
longest14 12
shortest26 5

Average nonzeros per row : 8.3
Standard deviation : 1.6

indexnonzeros
longest14 12
shortest26 5

Bandwidths Profile Storage
lower36 upper36
average |i-j|11 std.dev.11
minmaxave.std.dev.
lower bandwidth1 36 19 11
upper bandwidth1 36 19 11

Symmetric skyline storage requirement:899

Heaviest diagonals
offset from main0 -6 6 -24 24 -4 -2 2 4 -1
nonzeros48 36 36 24 24 20 20 20 20 12
accumulated percent12.0021.0030.0036.0042.0047.0052.0057.0062.0065.00

Top 10 out of 49 nonvoid diagonals.
Conditioning
Frobenius norm7.5e+09 condition number (est.)1.6e+06
2-norm (est.)3e+09 diagonal dominanceno


Set Information

Set BCSSTRUC1
Source: John Lewis, Boeing Computer Services, Seattle, Washington, USA
Discipline:Dynamic analyses in structural engineering
Accession:Summer 1982


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Last change in this page: Wed Sep 22 13:33:23 US/Eastern 2004 [Comments: ]