Dear Eugene,
I am still having trouble figuring exactly what it is you
are doing, to reproduce your error. For example, I don't
know how the 'RealTuple selectedTuple' argument to printTuple
relates to your FlatField.
Could you please put together a complete program that
illustrates the problem, and put it on a server for us.
If necessary, use our anonymous incoming ftp at:
ftp://hyde.ssec.wisc.edu/pub/incoming
Then please send me an email telling me the names of the
files, and how to run them. We should probably finish this
discussion off the list.
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
On Tue, 11 Jan 2000, Eugene Tan wrote:
> Dear Bill,
>
> I tried updating the source but it hasn't done anything. We still have the
> same problem. This is how we're printing out what's in the field which has
> worked for us from beginning to now.
>
> public static void printTuple(RealTuple selectedTuple)
> throws VisADException, RemoteException {
>
> Unit[] unitArray = selectedTuple.getTupleUnits();
> int dimension = selectedTuple.getDimension();
>
> for (int i=0; i < dimension; i++) {
> Real data = (Real)selectedTuple.getComponent(i);
>
> double dataValue = data.getValue();
> System.out.print("\tComponent: " + i + " ");
> System.out.print("\tType: " + data.getType() + " ");
> System.out.print("\tValue: " + data.getValue() + " ");
> System.out.print("\tUnits: " + data.getUnit());
> System.out.print("\n");
> }
> }
>
> After looking further, I've found another problem. I'm trying to convert
> 20 degrees celsius into kelvin and then changing it back to celsius. This
> is the output I'm getting:
>
> >From Celsius to Kelvin (looks like it works):
> Component: 0 Type: MinTemp Value: 293.1499938964844 Units: K
> Component: 1 Type: MaxTemp Value: 293.1499938964844 Units: K
>
> And then when I convert it back Celsius using the same code:
> Component: 0 Type: MinTemp Value: -253.14999389648438 Units: Cel
> Component: 1 Type: MaxTemp Value: -253.14999389648438 Units: Cel
>
> It looks like the program has deducted 273.15K from 20 degrees celsius?
>
> This is how our code does it:
>
> //field is the flatfield containing the original data
> float[][] values = field.getFloats();
> values = Unit.convertTuple(values, oldUnits, newUnits);
>
> //newField is the flatfield we're creating now - the code to do this is in
> //my previous mail
> newField.setSamples(values);
>
> Please tell me what I'm doing wrong as I'm stuck again. Do you have any
> suggestion of a better way?
>
> Thanks in advance.
>
> Eug.
>
> _--_|\ Eugene Tan <E.Tan@xxxxxxxxxx>
> / \ AutoTAF Project Developer
> \_.--.*/ Bureau of Meteorology, Melbourne, VIC 3001, Australia
> v Telephone: +613 9669 4652
>
> On Mon, 10 Jan 2000, From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx> wrote:
>
> > I'm not sure how you're printing the FlatField, but I did
> > find a bug in FlatField.toString() that could cause your
> > problem. I am at the AMS Conference in Long Beach this
> > week and cannot update our source server, but did put the
> > fix at:
> >
> > ftp://hyde.ssec.wisc.edu/pub/incoming/FlatField.java
> >
> > On Mon, 10 Jan 2000, Eugene Tan wrote:
> >
> > > We can't seem to convert some units properly. This is what we have:
> > >
> > > (in a for loop to print out the original units)
> > > Units:
> > > oldUnits: Cel
> > > oldUnits: Cel
> > > oldUnits: degrees_north
> > >
> > > We then change all the Cel (celsius) units to Kelvin by doing this:
> > >
> > > Unit[] newUnits = Unit.copyUnitsArray(oldUnits);
> > > Unit toUnit = SI.kelvin;
> > >
> > > for (int i=0; i < oldUnits.length; i++) {
> > > if (newUnits[i].toString().equals("Cel")) {
> > > newUnits[i]=toUnit;
> > > }
> > > }
> > >
> > > Printing out the new units array:
> > > (in a for loop to print out the new units)
> > > Units:
> > > newUnits: K
> > > newUnits: K
> > > newUnits: degrees_north
> > >
> > > We then create a FlatField ie.
> > >
> > > FlatField newField
> > > new FlatField((FunctionType) field.getType(),
> > > field.getDomainSet(),
> > > null,
> > > null,
> > > field.getRangeSets(),
> > > newUnits);
> > >
> > > When I printed out the contents of newField, this is the output I get:
> > > Component: 0 Type: MinTemp Value: NaN Units: Cel
> > > Component: 1 Type: MaxTemp Value: NaN Units: Cel
> > > Component: 2 Type: WindDir Value: NaN Units: degrees_north
> > >
> > > which is wrong. We want to convert the units for Component 0 & 1 to
> > > Kelvin but it keeps returning "Cel". Can anyone identify what we're doing
> > > wrong please?
>
>
