Hi John,
> I have data with a MathType like:
>
> (Time -> ((lat, lon) -> value))
>
> I would like to be able to do a combine on multiple cells like this in
> order to produce animations. When I do so I get the error:
>
> could not evaluate function "combine"
>
> Is there any way to make this work?
>
> MORE DETAIL:
> I am working on an educational application that uses the VisAD
> spreadsheet. What I would like to be able to do is have many cells of
> data at different time periods and allow students to assemble their own
> animations. The data files I import to VisAD are serialized VisAD
> objects. Each one has a Linear1DSet consisting of 1 element associated
> with time. The spatial data are mapped using a Linear2DSet.
It may be difficult to do this in the SpreadSheet, but the
API gives you a number of ways to program it in a "custom"
spread sheet. Basically, create a new FieldImpl with the
same MathType as your files, but whose domain Set is a
Gridded1DSet with as many time steps as you have altoghether
(it can be a Linear1DSet if the times are evenly spaced).
Then do something like:
for (int i=0; i<ntimes; i++) {
FlatField time_step = field[i].getSample(0);
new_field.setSample(i, time_step);
}
That is, take the single time step Filed from each file
and merge them into the new FieldImpl.
Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
