BCSSTK04: BCS Structural Engineering Matrices (eigenvalue matrices)
Oil rig -- not condensed

from set BCSSTRUC1, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM04 from BCSSTRUC1 set.

Download as

Compressed MatrixMarket format file: bcsstk04.mtx.gz (9863 bytes)
Compressed Harwell-Boeing format file: bcsstk04.rsa.gz (7219 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 ] 449111 bytes

Matrix Statistics

Size	Type
132 x 132, 1890 entries	real symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 3648 132 1758 1758 0
Column Data	Row Data
Average nonzeros per column : 28 Standard deviation : 11 index nonzeros longest 73 46 shortest 99 15	Average nonzeros per row : 28 Standard deviation : 11 index nonzeros longest 73 46 shortest 99 15
Bandwidths	Profile Storage
lower 48 upper 48 average |i-j| 18 std.dev. 11	min max ave. std.dev. lower bandwidth 1 48 29 10 upper bandwidth 1 48 29 10 Symmetric skyline storage requirement:3763
Heaviest diagonals
offset from main 0 -1 1 -24 -12 -6 6 12 24 -2 nonzeros 132 107 107 90 90 90 90 90 90 89 accumulated percent 3.62 6.55 9.48 11.95 14.42 16.89 19.35 21.82 24.29 26.73 Top 10 out of 95 nonvoid diagonals.
Conditioning
Frobenius norm 4.2e+07 condition number (est.) 5.6e+06 2-norm (est.) 9.6e+06 diagonal dominance no

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Last change in this page: Wed Sep 22 13:33:23 US/Eastern 2004 [Comments: ]