NOS3: Lanczos with partial reorthogonalization
Finite element approximation to biharmonic operator on a rectangular plate with one side fixed and the others free.

from set LANPRO, from the Harwell-Boeing Collection

Download as

Compressed MatrixMarket format file: nos3.mtx.gz (36240 bytes)
Compressed Harwell-Boeing format file: nos3.rsa.gz (17718 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 ] 365868 bytes

Matrix Statistics

Size	Type
960 x 960, 8402 entries	real symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 15844 960 7442 7442 0
Column Data	Row Data
Average nonzeros per column : 17 Standard deviation : 2.5 index nonzeros longest 43 18 shortest 39 6	Average nonzeros per row : 17 Standard deviation : 2.5 index nonzeros longest 43 18 shortest 39 6
Bandwidths	Profile Storage
lower 44 upper 44 average |i-j| 27 std.dev. 18	min max ave. std.dev. lower bandwidth 1 44 42 8 upper bandwidth 1 44 42 8 Symmetric skyline storage requirement:40061
Heaviest diagonals
offset from main 0 -40 40 -2 2 -1 1 -42 -38 38 nonzeros 960 920 920 912 912 885 885 874 874 874 accumulated percent 6.06 11.87 17.67 23.43 29.18 34.77 40.36 45.87 51.39 56.90 Top 10 out of 21 nonvoid diagonals.
Conditioning
Frobenius norm 7.7e+03 condition number (est.) 7.3e+04 2-norm (est.) 6.8e+02 diagonal dominance no

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Last change in this page: Wed Sep 22 13:33:41 US/Eastern 2004 [Comments: ]