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

from set PLATZ, from the Harwell-Boeing Collection

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.

Download as

Compressed MatrixMarket format file: plsk1919.mtx.gz (51406 bytes)
Compressed Harwell-Boeing format file: plsk1919.rza.gz (55589 bytes)

Visualizations

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

Structure Plot	City Plot
	3D Interactive City Plot
	[ VRML Version 2, gzipped ] 296597 bytes

Matrix Statistics

Size	Type
1919 x 1919, 4831 entries	real skew symmetric
Nonzeros
total diagonal below diagonal above diagonal A-A' 9662 0 4831 4831 9662
Column Data	Row Data
Average nonzeros per column : 5 Standard deviation : 1.2 index nonzeros longest 678 6 shortest 63 1	Average nonzeros per row : 5 Standard deviation : 1.2 index nonzeros longest 678 6 shortest 63 1
Bandwidths	Profile Storage
lower 1297 upper 1297 average |i-j| 8e+02 std.dev. 2.8e+02	min max ave. std.dev. lower bandwidth 2 1297 7.5e+02 4.1e+02 upper bandwidth 2 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 nonzeros 376 376 313 313 176 176 146 146 116 116 accumulated percent 3.89 7.78 11.02 14.26 16.08 17.91 19.42 20.93 22.13 23.33 Top 10 out of 248 nonvoid diagonals.
Conditioning
Frobenius norm 24 condition number (est.) 1e+02 2-norm (est.) 1.7 diagonal dominance no

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