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CEGB2919: Structural engineering matrices (unassembled)
Three-dimensional cylinder with flange

from set CEGB, from the Harwell-Boeing Collection

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


Note: The previously available version of this matrix in Matrix Market format refects an assembly which differs from what the contributor intended and has been withdrawn. Please discard it if you have taken a copy. The Harwell-Boeing file remains, but requires proper interpretation.


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Visualizations

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Structure Plot
structure plot


Matrix Statistics

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Size Type
2919 x 2919, 7593 entries pattern symmetric positive definite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
321543 2859 159342 159342 0
Column Data Row Data
Average nonzeros per column : 1.1e+02
Standard deviation : 42

indexnonzeros
longest1252 267
shortest13 0

Average nonzeros per row : 1.1e+02
Standard deviation : 42

indexnonzeros
longest1252 267
shortest13 0

Bandwidths Profile Storage
lower1899 upper1899
average |i-j|1.7e+02 std.dev.3.2e+02
minmaxave.std.dev.
lower bandwidth0 1898 3.4e+02 4.4e+02
upper bandwidth0 1898 3.4e+02 4.4e+02

Symmetric skyline storage requirement:983418

Heaviest diagonals
offset from main0 -1 1 -2 2 -3 3 -4 4 -5
nonzeros2859 2745 2745 2631 2631 2517 2517 2399 2399 2281
accumulated percent 0.89 1.74 2.60 3.41 4.23 5.02 5.80 6.54 7.29 8.00

Top 10 out of 3481 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.


Set Information

Set CEGB
Source: A.J. Donovan, CEGB, England.
Discipline:Finite-element calculations in structural engineering
Accession:Summer 1980


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Last change in this page: Wed Sep 22 13:33:30 US/Eastern 2004 [Comments: ]