Matrix WELL1033

WELL1033: Least squares problems in surveying

from set LSQ, from the Harwell-Boeing Collection

[Download] [Visualizations] [Matrix Statistics] [Set Information]

Download as

Compressed MatrixMarket format file: well1033.mtx.gz (28620 bytes)
Right-hand-side in MatrixMarket array format: well1033_rhs1.mtx.gz (6645 bytes)

Compressed Harwell-Boeing format file: well1033.rra.gz (29134 bytes)

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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 ] 132338 bytes

Size Type

1033 x 320, 4732 entries real unsymmetric

Nonzeros

total diagonal below diagonal above diagonal A-A'
4732 5 3782 945 N/A

Column Data Row Data

Average nonzeros per column : 15
Standard deviation : 36
index nonzeros
longest 222 283
shortest 7 1
Average nonzeros per row : 4.6
Standard deviation : 0.52
index nonzeros
longest 8 5
shortest 635 3

Bandwidths Profile Storage

lower 1033 upper 308
average |i-j| 3.5e+02 std.dev. 2.5e+02

min max ave. std.dev.
lower bandwidth 0 1032 4.4e+02 2.8e+02
upper bandwidth 0 307 12 45
Nonsymmetric skyline storage N/A

Heaviest diagonals

offset from main -652 -11 -352 -12 -159 -15 -695 -681 -660 -532
nonzeros 18 18 16 15 13 13 12 12 10 10
accumulated percent 0.38 0.76 1.10 1.42 1.69 1.97 2.22 2.47 2.68 2.90

Top 10 out of 1200 nonvoid diagonals.

Conditioning

Frobenius norm 18 condition number (est.) Not available.
2-norm (est.) 1.8 diagonal dominance no

Set Information

Set LSQ
Source:	Michael Saunders, SOL, Stanford University.
Discipline:	Surveying
Accession:	Summer 1979

The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

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Last change in this page: Wed Sep 22 13:33:45 US/Eastern 2004 [Comments: ]