LAP 25: Laplace finite-element matrices (unassembled)

from set LAPU, from the Harwell-Boeing Collection

Note: The previously available version of this matrix in Matrix Market format refects an assembly which differs from what the contributor intended and has been withdrawn. Please discard it if you have taken a copy. The Harwell-Boeing file remains, but requires proper interpretation.

Download as

Matrix Market format not available.
Compressed Harwell-Boeing format file: lap___25.pse.gz (254 bytes)

Visualizations

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

Structure Plot

Matrix Statistics

Size	Type
25 x 25, 64 entries	pattern symmetric indefinite
Nonzeros
total diagonal below diagonal above diagonal A-A' 169 25 72 72 0
Column Data	Row Data
Average nonzeros per column : 6.8 Standard deviation : 1.9 index nonzeros longest 7 9 shortest 1 4	Average nonzeros per row : 6.8 Standard deviation : 1.9 index nonzeros longest 7 9 shortest 1 4
Bandwidths	Profile Storage
lower 7 upper 7 average |i-j| 3.3 std.dev. 2.2	min max ave. std.dev. lower bandwidth 0 6 4.8 2.1 upper bandwidth 0 6 4.8 2.1 Symmetric skyline storage requirement:120
Heaviest diagonals
offset from main 0 -5 -1 1 5 -6 -4 4 6 nonzeros 25 20 20 20 20 16 16 16 16 accumulated percent 14.79 26.63 38.46 50.30 62.13 71.60 81.07 90.53 100.00 Top 9 out of 9 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.

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Last change in this page: Wed Sep 22 13:33:42 US/Eastern 2004 [Comments: ]