BCSSTK01: BCS Structural Engineering Matrices (eigenvalue matrices)
Small test problem

from set BCSSTRUC1, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM01 from BCSSTRUC1 set.

Download as

Compressed MatrixMarket format file: bcsstk01.mtx.gz (1511 bytes)
Compressed Harwell-Boeing format file: bcsstk01.rsa.gz (1422 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 ] 57579 bytes

Matrix Statistics

Size	Type
48 x 48, 224 entries	real symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 400 48 176 176 0
Column Data	Row Data
Average nonzeros per column : 8.3 Standard deviation : 1.6 index nonzeros longest 14 12 shortest 26 5	Average nonzeros per row : 8.3 Standard deviation : 1.6 index nonzeros longest 14 12 shortest 26 5
Bandwidths	Profile Storage
lower 36 upper 36 average |i-j| 11 std.dev. 11	min max ave. std.dev. lower bandwidth 1 36 19 11 upper bandwidth 1 36 19 11 Symmetric skyline storage requirement:899
Heaviest diagonals
offset from main 0 -6 6 -24 24 -4 -2 2 4 -1 nonzeros 48 36 36 24 24 20 20 20 20 12 accumulated percent 12.00 21.00 30.00 36.00 42.00 47.00 52.00 57.00 62.00 65.00 Top 10 out of 49 nonvoid diagonals.
Conditioning
Frobenius norm 7.5e+09 condition number (est.) 1.6e+06 2-norm (est.) 3e+09 diagonal dominance no

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