BCSSTK19: BCS Structural Engineering Matrices (eigenvalue problems)
Part of a suspension bridge

from set BCSSTRUC3, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM19 from BCSSTRUC3 set.
Siffness matrix is very poorly conditioned.

Download as

Compressed MatrixMarket format file: bcsstk19.mtx.gz (29225 bytes)
Compressed Harwell-Boeing format file: bcsstk19.rsa.gz (24357 bytes)

Visualizations

Click on image to get an enlarged version. Click on label to get an explanation.

Structure Plot	City Plot
	3D Interactive City Plot
	[ VRML Version 2, gzipped ] 199128 bytes

Matrix Statistics

Size	Type
817 x 817, 3835 entries	real symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 6853 817 3018 3018 0
Column Data	Row Data
Average nonzeros per column : 8.4 Standard deviation : 2.3 index nonzeros longest 4 11 shortest 771 2	Average nonzeros per row : 8.4 Standard deviation : 2.3 index nonzeros longest 4 11 shortest 771 2
Bandwidths	Profile Storage
lower 568 upper 568 average |i-j| 44 std.dev. 1e+02	min max ave. std.dev. lower bandwidth 1 568 92 1.3e+02 upper bandwidth 1 568 92 1.3e+02 Symmetric skyline storage requirement:74868
Heaviest diagonals
offset from main 0 -3 3 -1 1 -2 2 -5 5 -4 nonzeros 817 792 792 635 635 525 525 265 265 261 accumulated percent 11.92 23.48 35.04 44.30 53.57 61.23 68.89 72.76 76.62 80.43 Top 10 out of 469 nonvoid diagonals.
Conditioning
Frobenius norm 9.6e+14 condition number (est.) 2.8e+11 2-norm (est.) 1.9e+14 diagonal dominance no

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:33:26 US/Eastern 2004 [Comments: ]