The Matrix Market

Home Search Browse Resources

LSHP1561: Graded L-shape patterns

from set LSHAPE, from the Harwell-Boeing Collection

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


Download as

Help: My browser can't read the compressed data files. What now?


Visualizations

Click on image to get an enlarged version. Click on label to get an explanation.

Structure Plot
structure plot


Matrix Statistics

Click on label to get an explanation.

Size Type
1561 x 1561, 6121 entries pattern symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
10681 1561 4560 4560 0
Column Data Row Data
Average nonzeros per column : 6.8
Standard deviation : 0.54

indexnonzeros
longest1 7
shortest11 4

Average nonzeros per row : 6.8
Standard deviation : 0.54

indexnonzeros
longest1 7
shortest11 4

Bandwidths Profile Storage
lower1540 upper1540
average |i-j|41 std.dev.1.5e+02
minmaxave.std.dev.
lower bandwidth1 1540 69 2e+02
upper bandwidth1 1540 69 2e+02

Symmetric skyline storage requirement:108195

Heaviest diagonals
offset from main0 -1 1 -7 7 -6 6 -5 5 -8
nonzeros1561 1339 1339 390 390 330 330 270 270 210
accumulated percent14.6127.1539.6943.3446.9950.0853.1755.7058.2260.19

Top 10 out of 653 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


The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

[ Home ] [ Search ] [ Browse ] [ Resources ]

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