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LSHP 778: Graded L-shape patterns

from set LSHAPE, from the Harwell-Boeing Collection

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Visualizations

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Structure Plot
structure plot


Matrix Statistics

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Size Type
778 x 778, 3025 entries pattern symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
5272 778 2247 2247 0
Column Data Row Data
Average nonzeros per column : 6.8
Standard deviation : 0.64

indexnonzeros
longest1 7
shortest8 4

Average nonzeros per row : 6.8
Standard deviation : 0.64

indexnonzeros
longest1 7
shortest8 4

Bandwidths Profile Storage
lower763 upper763
average |i-j|28 std.dev.91
minmaxave.std.dev.
lower bandwidth1 763 48 1.2e+02
upper bandwidth1 763 48 1.2e+02

Symmetric skyline storage requirement:37062

Heaviest diagonals
offset from main0 -1 1 -4 4 -3 3 -2 2 -5
nonzeros778 646 646 210 210 150 150 128 128 120
accumulated percent14.7627.0139.2643.2547.2350.0852.9255.3557.7860.05

Top 10 out of 411 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.


Set Information

Set LSHAPE
Source: Alan George, University of Waterloo, Canada.
Discipline:Finite-element model problem
Accession:January 1978


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Last change in this page: Wed Sep 22 13:33:44 US/Eastern 2004 [Comments: ]