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NOS5: Lanczos with partial reorthogonalization
3 story building with attached tower.

from set LANPRO, from the Harwell-Boeing Collection

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Each beam is modeled as a finite element approximation to biharmonic operator with one end free and one end fixed. 80 elements with 3 DOF per node.


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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 ] 142631 bytes


Matrix Statistics

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Size Type
468 x 468, 2820 entries real symmetric positive definite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
5172 468 2352 2352 0
Column Data Row Data
Average nonzeros per column : 11
Standard deviation : 2.5

indexnonzeros
longest211 23
shortest2 7

Average nonzeros per row : 11
Standard deviation : 2.5

indexnonzeros
longest211 23
shortest2 7

Bandwidths Profile Storage
lower179 upper179
average |i-j|26 std.dev.31
minmaxave.std.dev.
lower bandwidth1 179 59 32
upper bandwidth1 179 59 32

Symmetric skyline storage requirement:27754

Heaviest diagonals
offset from main0 -6 6 -54 54 -18 18 -2 2 -4
nonzeros468 324 324 270 270 204 204 152 152 121
accumulated percent 9.0515.3121.5826.8032.0235.9639.9142.8545.7848.12

Top 10 out of 201 nonvoid diagonals.
Conditioning
Frobenius norm5e+06 condition number (est.)2.9e+04
2-norm (est.)5.8e+05 diagonal dominanceno


Set Information

Set LANPRO
Source: Horst Simon, Boeing Computer Services, Seattle, Washington.
Discipline:Linear equations in structural engineering
Accession:Spring 1982


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Last change in this page: Wed Sep 22 13:33:41 US/Eastern 2004 [Comments: ]