Many thanks, that does the job nicely! We will be driving this stuff
pretty hard over the coming weeks/months, so I'll certainly let you know
if we see anything else like this.
Steve Emmerson wrote:
Subject: Problems with degrees and maths operations
Date: Thu, 15 Aug 2002 16:01:27 +1000
From: James Kelly <j.kelly@xxxxxxxxxx>
The above message contained the following:
I have positional data containing latitudes and longitudes, and wish
to to get the average position. There are some useful Data methods
such as "add" and "divide" which help here.
However I'm getting some unexpected results, as illustrated by the
attached code (AverageUnits.java)
I modified some core VisAD classes (primarily RealType, Real, and
FlatField) to solve your problem. A new VisAD release that incorporates
these changes can be found at
It passes the test program that you sent (thanks!).
The code that was modified is complex, fundamental to the VisAD package,
and extremely difficult to exhaustively test. If you encounter problems,
would you please notify me immediately.