BCSSTK23: BCS Structural Engineering Matrices (eigenvalue problems)
Part of a 3D globally triang. building

from set BCSSTRUC3, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM23 from BCSSTRUC3 set.
Smallest eigenvalue has multiplicity 118.

Download as

Compressed MatrixMarket format file: bcsstk23.mtx.gz (213119 bytes)
Compressed Harwell-Boeing format file: bcsstk23.rsa.gz (160269 bytes)

Visualizations

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

Structure Plot	City Plot

Matrix Statistics

Size	Type
3134 x 3134, 24156 entries	real symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 45178 3134 21022 21022 0
Column Data	Row Data
Average nonzeros per column : 14 Standard deviation : 4.9 index nonzeros longest 1555 31 shortest 1880 2	Average nonzeros per row : 14 Standard deviation : 4.9 index nonzeros longest 1555 31 shortest 1880 2
Bandwidths	Profile Storage
lower 450 upper 450 average |i-j| 1.2e+02 std.dev. 1.6e+02	min max ave. std.dev. lower bandwidth 1 450 3.3e+02 1.4e+02 upper bandwidth 1 450 3.3e+02 1.4e+02 Symmetric skyline storage requirement:1045221
Heaviest diagonals
offset from main 0 -4 4 -2 2 -6 6 -438 438 -1 nonzeros 3134 2161 2161 2030 2030 1954 1954 1368 1368 922 accumulated percent 6.94 11.72 16.50 21.00 25.49 29.82 34.14 37.17 40.20 42.24 Top 10 out of 593 nonvoid diagonals.
Conditioning
Frobenius norm 9.1e+16 condition number (est.) 6.9e+12 2-norm (est.) 2.3e+16 diagonal dominance no

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