Matrix WATT 1

WATT 1: Petroleum engineering

from set WATT, from the Harwell-Boeing Collection

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Visualizations

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Structure Plot	City Plot

Spectral Portrait

Size Type

1856 x 1856, 11360 entries real unsymmetric

Nonzeros

total diagonal below diagonal above diagonal A-A'
11360 1856 4752 4752 256

Column Data Row Data

Average nonzeros per column : 6.1
Standard deviation : 1.3
index nonzeros
longest 138 7
shortest 1 2
Average nonzeros per row : 6.1
Standard deviation : 1.5
index nonzeros
longest 74 7
shortest 1 1

Bandwidths Profile Storage

lower 65 upper 65
average |i-j| 22 std.dev. 28

min max ave. std.dev.
lower bandwidth 0 64 60 16
upper bandwidth 0 64 60 15
Nonsymmetric skyline storage 219783

Heaviest diagonals

offset from main 0 -64 64 -8 -1 1 8
nonzeros 1856 1728 1728 1512 1512 1512 1512
accumulated percent 16.34 31.55 46.76 60.07 73.38 86.69 100.00

Top 7 out of 7 nonvoid diagonals.

Conditioning

Frobenius norm 11 condition number (est.) 5.38e+09
2-norm (est.) 1 diagonal dominance no

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: ]