## BCSSTK06: BCS Structural Engineering Matrices (eigenvalue matrices)Medium test problem -- lumped mass

### from set BCSSTRUC1, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM06 from BCSSTRUC1 set.
BCSSTK06 and BCSSTM06 repesent the lumped (diagonal) mass formulation for the same problem for which BCSSTK07 and BCSSTM07 form the consistent mass formulation.

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## Visualizations

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Structure Plot City Plot
3D Interactive City Plot

[ VRML Version 2, gzipped ] 211843 bytes

## Matrix Statistics

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Size Type
420 x 420, 4140 entries real symmetric positive definite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
7860 420 3720 3720 0
Column Data Row Data
Average nonzeros per column : 19
Standard deviation : 6.5

index nonzeros 57 28 3 2

Average nonzeros per row : 19
Standard deviation : 6.5

index nonzeros 57 28 3 2

Bandwidths Profile Storage
 lower upper 48 48 18 19
minmaxave.std.dev.
lower bandwidth1 48 36 17
upper bandwidth1 48 36 17

Symmetric skyline storage requirement:15111

Heaviest diagonals
 offset from main nonzeros accumulated percent 0 -1 1 -2 2 -3 3 -6 6 -42 420 357 357 347 347 334 334 330 330 324 5.34 9.89 14.43 18.84 23.26 27.51 31.76 35.95 40.15 44.27

Top 10 out of 43 nonvoid diagonals.
Conditioning
 Frobenius norm condition number (est.) 2.1e+10 1.2e+07 3.5e+09 no

## 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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