BCSSTK20: BCS Structural Engineering Matrices (eigenvalue problems)
Frame within 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 BCSSTM20 from BCSSTRUC3 set.
Siffness matrix is very poorly conditioned.

Download as

Compressed MatrixMarket format file: bcsstk20.mtx.gz (15843 bytes)
Compressed Harwell-Boeing format file: bcsstk20.rsa.gz (13001 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 ] 450309 bytes

Matrix Statistics

Size	Type
485 x 485, 1810 entries	real symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 3135 485 1325 1325 0
Column Data	Row Data
Average nonzeros per column : 6.5 Standard deviation : 2.4 index nonzeros longest 185 11 shortest 2 2	Average nonzeros per row : 6.5 Standard deviation : 2.4 index nonzeros longest 185 11 shortest 2 2
Bandwidths	Profile Storage
lower 21 upper 21 average |i-j| 6 std.dev. 4.9	min max ave. std.dev. lower bandwidth 1 21 9.9 4.2 upper bandwidth 1 21 9.9 4.2 Symmetric skyline storage requirement:4794
Heaviest diagonals
offset from main 0 -1 1 -9 9 -2 2 -3 3 -10 nonzeros 485 184 184 179 179 144 144 120 120 95 accumulated percent 15.47 21.34 27.21 32.92 38.63 43.22 47.81 51.64 55.47 58.50 Top 10 out of 41 nonvoid diagonals.
Conditioning
Frobenius norm 2.9e+16 condition number (est.) 7.5e+12 2-norm (est.) 1.3e+16 diagonal dominance no

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

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