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ILLC1850: Least squares problems in surveying

from set LSQ, from the Harwell-Boeing Collection

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Visualizations

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Structure Plot City Plot
structure plot city plot
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Matrix Statistics

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Size Type
1850 x 712, 8758 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
8636 7 6708 1921 N/A
Column Data Row Data
Average nonzeros per column : 12
Standard deviation : 32

indexnonzeros
longest699 417
shortest104 1

Average nonzeros per row : 4.7
Standard deviation : 0.52

indexnonzeros
longest3 5
shortest5 3

Bandwidths Profile Storage
lower1827 upper698
average |i-j|5.9e+02 std.dev.4.2e+02
minmaxave.std.dev.
lower bandwidth0 1826 8e+02 5.1e+02
upper bandwidth0 697 29 93

Nonsymmetric skyline storage N/A

Heaviest diagonals
offset from main-1077 -1052 -181 -1082 -1071 -180 -179 -1178 -1123 -1068
nonzeros18 15 14 13 12 12 12 11 11 11
accumulated percent 0.21 0.38 0.54 0.69 0.83 0.97 1.11 1.24 1.37 1.49

Top 10 out of 2262 nonvoid diagonals.
Conditioning
Frobenius norm27 condition number (est.)Not available.
2-norm (est.)2.1 diagonal dominanceno


Set Information

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


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