Matrix WELL1850

WELL1850: 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: well1850.mtx.gz (53817 bytes)
Right-hand-side in MatrixMarket array format: well1850_rhs1.mtx.gz (11906 bytes)

Compressed Harwell-Boeing format file: well1850.rra.gz (54084 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 ] 236834 bytes

Size Type

1850 x 712, 8758 entries real unsymmetric

Nonzeros

total diagonal below diagonal above diagonal A-A'
8755 7 6763 1985 N/A

Column Data Row Data

Average nonzeros per column : 12
Standard deviation : 32
index nonzeros
longest 699 417
shortest 104 1
Average nonzeros per row : 4.7
Standard deviation : 0.46
index nonzeros
longest 1 5
shortest 230 3

Bandwidths Profile Storage

lower 1827 upper 698
average |i-j| 5.8e+02 std.dev. 4.2e+02

min max ave. std.dev.
lower bandwidth 0 1826 8e+02 5.1e+02
upper bandwidth 0 697 29 93
Nonsymmetric skyline storage N/A

Heaviest diagonals

offset from main -1077 -1052 -181 -1082 -179 -1071 -180 -1178 -1123 -1068
nonzeros 18 15 14 13 13 12 12 11 11 11
accumulated percent 0.21 0.38 0.54 0.69 0.83 0.97 1.11 1.23 1.36 1.48

Top 10 out of 2262 nonvoid diagonals.

Conditioning

Frobenius norm 27 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: ]