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PLSK1919: Platzman's oceanographic models
skew-symmetric full model

from set PLATZ, from the Harwell-Boeing Collection

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


A finite-difference model for the shallow wave equations for the Atlantic and Indian Oceans. Represents a purely imaginary skew-symmetric matrix. Matrix PLAT1919 is its (negative) square.


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Visualizations

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

[ VRML Version 2, gzipped ] 296597 bytes


Matrix Statistics

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Size Type
1919 x 1919, 4831 entries real skew symmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
9662 0 4831 4831 9662
Column Data Row Data
Average nonzeros per column : 5
Standard deviation : 1.2

indexnonzeros
longest678 6
shortest63 1

Average nonzeros per row : 5
Standard deviation : 1.2

indexnonzeros
longest678 6
shortest63 1

Bandwidths Profile Storage
lower1297 upper1297
average |i-j|8e+02 std.dev.2.8e+02
minmaxave.std.dev.
lower bandwidth2 1297 7.5e+02 4.1e+02
upper bandwidth2 1297 7.5e+02 4.1e+02

Symmetric skyline storage requirement:1437060

Heaviest diagonals
offset from main-1260 1260 -1296 1296 -627 627 -628 628 -635 635
nonzeros376 376 313 313 176 176 146 146 116 116
accumulated percent 3.89 7.7811.0214.2616.0817.9119.4220.9322.1323.33

Top 10 out of 248 nonvoid diagonals.
Conditioning
Frobenius norm24 condition number (est.)1e+02
2-norm (est.)1.7 diagonal dominanceno


Set Information

Set PLATZ
Source: John Lewis, Boeing Computer Services, Seattle, Washington
Discipline:Oceanic modeling
Accession:Summer 1975


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Last change in this page: Wed Sep 22 13:33:48 US/Eastern 2004 [Comments: ]