NOS4: Lanczos with partial reorthogonalization
Finite element approximation to a beam structure.

from set LANPRO, from the Harwell-Boeing Collection

Download as

Compressed MatrixMarket format file: nos4.mtx.gz (1431 bytes)
Compressed Harwell-Boeing format file: nos4.rsa.gz (1109 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 ] 84804 bytes

Matrix Statistics

Size	Type
100 x 100, 347 entries	real symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 594 100 247 247 0
Column Data	Row Data
Average nonzeros per column : 5.9 Standard deviation : 1.5 index nonzeros longest 5 7 shortest 4 2	Average nonzeros per row : 5.9 Standard deviation : 1.5 index nonzeros longest 5 7 shortest 4 2
Bandwidths	Profile Storage
lower 14 upper 14 average |i-j| 6.7 std.dev. 4.7	min max ave. std.dev. lower bandwidth 1 14 8.7 5.1 upper bandwidth 1 14 8.7 5.1 Symmetric skyline storage requirement:866
Heaviest diagonals
offset from main 0 -10 10 -2 2 -12 -8 8 12 -13 nonzeros 100 45 45 40 40 36 36 36 36 18 accumulated percent 16.84 24.41 31.99 38.72 45.45 51.52 57.58 63.64 69.70 72.73 Top 10 out of 19 nonvoid diagonals.
Conditioning
Frobenius norm 4.2 condition number (est.) 2.7e+03 2-norm (est.) 0.85 diagonal dominance no

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