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YOUNG1C: Acoustic scattering

from set ACOUST, from the Harwell-Boeing Collection

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Warning: This matrix is identified as symmetric since it was originally specified as being so in the header of its Harwell-Boeing file representation. Unfortunately, the data within the file itself is not symmetric. This inconsistency has been propagated into the Matrix Market format file header also. This has lead to some confusion in the use of this matrix: Should the header be respected and the data symmetrized, or should the header be ignored and the matrix treated as nonsymmetric? The matrix statistics we present assume the former, which is also what is done by Matlab.

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Structure Plot City Plot
structure plot city plot
3D Interactive City Plot

[ VRML Version 2, gzipped ] 177394 bytes

Matrix Statistics

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Size Type
841 x 841, 4089 entries complex symmetric indefinite
totaldiagonalbelow diagonalabove diagonalA-A'A-A*
4089 841 1624 1624 0 190
Column Data Row Data
Average nonzeros per column : 4.9
Standard deviation : 0.36

longest31 5
shortest1 3

Average nonzeros per row : 4.9
Standard deviation : 0.36

longest31 5
shortest1 3

Bandwidths Profile Storage
lower30 upper30
average |i-j|12
lower bandwidth1 30 29 5.1
upper bandwidth1 30 29 5.1

Symmetric skyline storage requirement:24417

Heaviest diagonals
offset from main0 -29 -1 1 29
nonzeros841 812 812 812 812
accumulated percent20.5740.4360.2880.14100.00

Top 5 out of 5 nonvoid diagonals.
Frobenius norm8.5e+03 condition number (est.)2.9e+02
2-norm (est.)7.2e+02 diagonal dominanceno

Set Information

Source: David P. Young, Boeing Computer Services, Seattle, Washington
Discipline:Dynamic analysis in structural engineering
Accession:Spring 1984

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Last change in this page: Wed Sep 22 13:33:20 US/Eastern 2004 [Comments: ]