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BCSSTK23: BCS Structural Engineering Matrices (eigenvalue problems)
Part of a 3D globally triang. building

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 BCSSTM23 from BCSSTRUC3 set.
Smallest eigenvalue has multiplicity 118.


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Visualizations

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Structure Plot City Plot
structure plot city plot


Matrix Statistics

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Size Type
3134 x 3134, 24156 entries real symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
45178 3134 21022 21022 0
Column Data Row Data
Average nonzeros per column : 14
Standard deviation : 4.9

indexnonzeros
longest1555 31
shortest1880 2

Average nonzeros per row : 14
Standard deviation : 4.9

indexnonzeros
longest1555 31
shortest1880 2

Bandwidths Profile Storage
lower450 upper450
average |i-j|1.2e+02 std.dev.1.6e+02
minmaxave.std.dev.
lower bandwidth1 450 3.3e+02 1.4e+02
upper bandwidth1 450 3.3e+02 1.4e+02

Symmetric skyline storage requirement:1045221

Heaviest diagonals
offset from main0 -4 4 -2 2 -6 6 -438 438 -1
nonzeros3134 2161 2161 2030 2030 1954 1954 1368 1368 922
accumulated percent 6.9411.7216.5021.0025.4929.8234.1437.1740.2042.24

Top 10 out of 593 nonvoid diagonals.
Conditioning
Frobenius norm9.1e+16 condition number (est.)6.9e+12
2-norm (est.)2.3e+16 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: ]