Matrix LSHP 265

LSHP 265: 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_265.mtx.gz (2138 bytes)

Compressed Harwell-Boeing format file: lshp_265.psa.gz (2107 bytes)

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Visualizations

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Structure Plot

Size Type

265 x 265, 1009 entries pattern symmetric indefinite

Nonzeros

total diagonal below diagonal above diagonal A-A'
1753 265 744 744 0

Column Data Row Data

Average nonzeros per column : 6.6
Standard deviation : 0.81
index nonzeros
longest 1 7
shortest 5 4
Average nonzeros per row : 6.6
Standard deviation : 0.81
index nonzeros
longest 1 7
shortest 5 4

Bandwidths Profile Storage

lower 257 upper 257
average |i-j| 16 std.dev. 40

min max ave. std.dev.
lower bandwidth 1 257 27 52
upper bandwidth 1 257 27 52
Symmetric skyline storage requirement:7104

Heaviest diagonals

offset from main 0 -1 1 -2 2 -7 7 -4 4 -8
nonzeros 265 223 223 68 68 49 49 44 44 30
accumulated percent 15.12 27.84 40.56 44.44 48.32 51.11 53.91 56.42 58.93 60.64

Top 10 out of 195 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: ]