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CEGB3306: Structural engineering matrices (unassembled)
Framework problem essentially in two dimensions

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this matrix in Matrix Market format refects an assembly which differs from what the contributor intended and has been withdrawn.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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Structure Plot
structure plot

Matrix Statistics

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Size Type
3306 x 3306, 9378 entries pattern symmetric positive definite
totaldiagonalbelow diagonalabove diagonalA-A'
74916 3222 35847 35847 0
Column Data Row Data
Average nonzeros per column : 23
Standard deviation : 11

longest571 54
shortest211 0

Average nonzeros per row : 23
Standard deviation : 11

longest571 54
shortest211 0

Bandwidths Profile Storage
lower468 upper468
average |i-j|1.5e+02
lower bandwidth0 467 1.1e+02 1.5e+02
upper bandwidth0 467 1.1e+02 1.5e+02

Symmetric skyline storage requirement:356967

Heaviest diagonals
offset from main0 -1 1 -2 2 -3 3 -4 4 -5
nonzeros3222 2822 2822 2422 2422 2022 2022 1622 1622 1222
accumulated percent 4.30 8.0711.8315.0718.3021.0023.7025.8628.0329.66

Top 10 out of 935 nonvoid diagonals.
Pattern matrix. No conditioning information.

Set Information

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: ]