Matrix LSHP 577

LSHP 577: Graded L-shape patterns

from set LSHAPE, from the Harwell-Boeing Collection

[Download] [Visualizations] [Matrix Statistics] [Set Information]

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Compressed MatrixMarket format file: lshp_577.mtx.gz (4697 bytes)

Compressed Harwell-Boeing format file: lshp_577.psa.gz (4697 bytes)

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Visualizations

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Structure Plot

Size Type

577 x 577, 2233 entries pattern symmetric indefinite

Nonzeros

total diagonal below diagonal above diagonal A-A'
3889 577 1656 1656 0

Column Data Row Data

Average nonzeros per column : 6.7
Standard deviation : 0.69
index nonzeros
longest 1 7
shortest 7 4
Average nonzeros per row : 6.7
Standard deviation : 0.69
index nonzeros
longest 1 7
shortest 7 4

Bandwidths Profile Storage

lower 564 upper 564
average |i-j| 24 std.dev. 72

min max ave. std.dev.
lower bandwidth 1 564 41 94
upper bandwidth 1 564 41 94
Symmetric skyline storage requirement:23393

Heaviest diagonals

offset from main 0 -1 1 -3 3 -2 2 -4 4 -10
nonzeros 577 475 475 150 150 128 128 90 90 78
accumulated percent 14.84 27.05 39.26 43.12 46.98 50.27 53.56 55.88 58.19 60.20

Top 10 out of 325 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: ]