The Matrix Market

Home Search Browse Resources

WILL57: Original Harwell sparse matrix test collection
Jacobian of emitter-follower-current switch circuit

from set SMTAPE, from the Harwell-Boeing Collection

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


Given by Willoughby in Reid, 1970.


Download as

Help: My browser can't read the compressed data files. What now?


Visualizations

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

Structure Plot
structure plot


Matrix Statistics

Click on label to get an explanation.

Size Type
57 x 57, 281 entries pattern unsymmetric
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
281 57 122 102 60
Column Data Row Data
Average nonzeros per column : 4.9
Standard deviation : 2.3

indexnonzeros
longest29 11
shortest4 2

Average nonzeros per row : 4.9
Standard deviation : 2.1

indexnonzeros
longest29 11
shortest4 2

Bandwidths Profile Storage
lower45 upper45
average |i-j|5.4 std.dev.9.1
minmaxave.std.dev.
lower bandwidth0 44 5.8 11
upper bandwidth0 44 5.4 9.9

Nonsymmetric skyline storage 581

Heaviest diagonals
offset from main0 -1 1 -2 2 -10 -7 -3 3 -11
nonzeros57 42 42 14 13 7 7 7 7 6
accumulated percent20.2835.2350.1855.1659.7962.2864.7767.2669.7571.89

Top 10 out of 44 nonvoid diagonals.
Conditioning
Pattern matrix. No conditioning information.


Set Information

Set SMTAPE
Source: Harwell Laboratory, England.
Discipline:Variety of disciplines
Accession:Summer 1978


The Matrix Market is a service of the Mathematical and Computational Sciences Division / Information Technology Laboratory / National Institute of Standards and Technology.

[ Home ] [ Search ] [ Browse ] [ Resources ]

Last change in this page: Wed Sep 22 13:33:51 US/Eastern 2004 [Comments: ]