LUND A: Original Harwell sparse matrix test collection
stiffness and mass

from set SMTAPE, from the Harwell-Boeing Collection

Generalized eigenvalue problem Ax=(lambda)Bx. This is matrix A; matrix B is LUND B from the SMTAPE set.

Download as

Compressed MatrixMarket format file: lund_a.mtx.gz (6628 bytes)
Compressed Harwell-Boeing format file: lund_a.rsa.gz (4207 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 ] 306707 bytes

Matrix Statistics

Size	Type
147 x 147, 1298 entries	real symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 2449 147 1151 1151 0
Column Data	Row Data
Average nonzeros per column : 17 Standard deviation : 4.4 index nonzeros longest 33 21 shortest 147 5	Average nonzeros per row : 17 Standard deviation : 4.4 index nonzeros longest 33 21 shortest 147 5
Bandwidths	Profile Storage
lower 24 upper 24 average |i-j| 11 std.dev. 8.7	min max ave. std.dev. lower bandwidth 0 23 20 5.3 upper bandwidth 0 23 20 5.3 Symmetric skyline storage requirement:2870
Heaviest diagonals
offset from main 0 -1 1 -2 2 -3 3 -21 21 -20 nonzeros 147 139 139 126 126 113 113 110 110 108 accumulated percent 6.00 11.68 17.35 22.50 27.64 32.26 36.87 41.36 45.86 50.27 Top 10 out of 45 nonvoid diagonals.
Conditioning
Frobenius norm 1.4e+09 condition number (est.) 5.4e+06 2-norm (est.) 2.2e+08 diagonal dominance no

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Last change in this page: Wed Sep 22 13:33:51 US/Eastern 2004 [Comments: ]