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JPWH 991: Circuit physics modeling
Computer random simulation of a circuit physics model

from set CIRPHYS, from the Harwell-Boeing Collection

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


Was using MA28 and was concerned about the amount of fill-in. Example in test set is of order 991 but is indicative of structure of larger matrices (to order 3000) from the same modeling exercise.
Unsymmetric but with variable band characteristics.


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Visualizations

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Structure Plot City Plot
structure plot city plot
Spectral Portrait 3D Interactive City Plot
spectral portrait

[ VRML Version 2, gzipped ] 139880 bytes


Matrix Statistics

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Size Type
991 x 991, 6027 entries real unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
6027 991 2538 2498 640
Column Data Row Data
Average nonzeros per column : 6.1
Standard deviation : 2.1

indexnonzeros
longest403 16
shortest6 1

Average nonzeros per row : 6.1
Standard deviation : 2.6

indexnonzeros
longest403 16
shortest1 1

Bandwidths Profile Storage
lower198 upper198
average |i-j|51 std.dev.38
minmaxave.std.dev.
lower bandwidth1 198 79 40
upper bandwidth1 198 78 39

Nonsymmetric skyline storage 154402

Heaviest diagonals
offset from main0 -48 -64 59 48 -59 -57 -56 45 56
nonzeros991 38 37 36 35 34 34 34 34 34
accumulated percent16.4417.0717.6918.2818.8719.4319.9920.5621.1221.69

Top 10 out of 317 nonvoid diagonals.
Conditioning
Frobenius norm1.9e+02 condition number (est.)7.3e+02
2-norm (est.)16 diagonal dominanceweak


Set Information

Set CIRPHYS
Source: J P Whelan, Circuit Physics and Applications Division, Philips Research Laboratories, Redhill, Surrey, England.
Discipline:Circuit physics
Accession:December 1978


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Last change in this page: Wed Sep 22 13:33:32 US/Eastern 2004 [Comments: ]