LAP 25: Laplace finite-element matrices (unassembled)
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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this matrix in Matrix Market format refects an assembly which differs from what the contributor intended and has been withdrawn.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 .

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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.

Set Information
Set LAPU
Source:
Iain Duff, Harwell Laboratory.
Discipline: Model finite-element calculations
Accession: Summer 1980

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