From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM26 from BCSSTRUC4 set.
BCSSTK26/BCSSTM26 is from a vibration station. It is of interest because the number of eigenvalues needed for the seismic analysis was quite large  the lowest 197. The large number effectively defeats sparse eigenvalue routines that do not shift, and stands as a real benchmark for shifted algorithms.
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Structure Plot  City Plot 

Size  Type  

1922 x 1922, 16129 entries  real symmetric indefinite  
Nonzeros  


Column Data  Row Data  
Average nonzeros per column : 16 Standard deviation : 5.7

Average nonzeros per row : 16 Standard deviation : 5.7


Bandwidths  Profile Storage  

Symmetric skyline storage requirement:191968 

Heaviest diagonals  
Top 10 out of 467 nonvoid diagonals. 

Conditioning  

Set BCSSTRUC4  

Source:  Andy Mera, Randy Cigel, and John Lewis, Boeing Computer Services, Seattle, Washington. 
Discipline:  Dynamic analyses in structural engineering. 
Accession:  Summer 1984 and spring 1986 
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Last change in this page: Wed Sep 22 13:33:27 US/Eastern 2004 [Comments: ]