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WATT 2: Petroleum engineering

from set WATT, from the Harwell-Boeing Collection

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Visualizations

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Structure Plot City Plot
structure plot city plot
Spectral Portrait
spectral portrait


Matrix Statistics

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Size Type
1856 x 1856, 11550 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
11550 1856 4815 4879 508
Column Data Row Data
Average nonzeros per column : 6.2
Standard deviation : 1.8

indexnonzeros
longest1 65
shortest1793 2

Average nonzeros per row : 6.2
Standard deviation : 3.2

indexnonzeros
longest1 128
shortest1793 1

Bandwidths Profile Storage
lower65 upper128
average |i-j|22 std.dev.28
minmaxave.std.dev.
lower bandwidth0 64 61 13
upper bandwidth0 127 64 9.7

Nonsymmetric skyline storage 229472

Heaviest diagonals
offset from main0 64 -64 -8 -1 1 8 -63 -62 -61
nonzeros1856 1729 1728 1513 1513 1513 1513 1 1 1
accumulated percent16.0731.0446.0059.1072.2085.3098.4098.4198.4298.42

Top 10 out of 192 nonvoid diagonals.
Conditioning
Frobenius norm14 condition number (est.)1.37e+12
2-norm (est.)8 diagonal dominanceno


Set Information

Set WATT
Source: John Somerville, Department of Petroleum Engineering, Heriot-Watt University, Edinburgh, Scotland.
Discipline:Petroleum engineering
Accession:December 1983


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Last change in this page: Wed Sep 22 13:33:55 US/Eastern 2004 [Comments: ]