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[IDV #DIZ-849299]: NullPointerException adding two different fields

Paul,

I belatedly read the "Adding two different 4d grids" thread on the IDV Users 
list.

I have been using your formula to add 4D fields that physically do not make 
sense (e.g., geopotential height and relative humidity) without problems in the 
IDV. The IDV/Jython seem to be handling the unit incompatibility without 
problems for the fields I am experimenting with. Again, specific examples of 
what you are trying to achieve may be helpful.

Best,

Unidata IDV Support


> Paul,
> 
> I tried your formula and was able to make it work in my scenario so we are 
> going to have to find out a bit more about what you are trying to achieve. 
> Where is the data coming from? What fields are you trying to add? You can 
> upload a data file for us to examine at 
> http://motherlode.ucar.edu/repository/alias/idvupload.
> 
> Best Wishes,
> 
> Unidata IDV Support
> 
> 
> > Full Name: Paul Graham
> > Email Address: address@hidden
> > Organization: Weathersim
> > Package Version: 4.0u1 build date:2013-03-29 18:10 UTC
> > Operating System: Mac OS X
> > Hardware: Java: home: 
> > /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home version: 
> > 1.6.0_51 j3d:1.5.2 fcs (build4)
> > Description of problem:
> >
> > When attempting to add two different fields in IDV using the following
> > simple Jython method:
> >
> > def simpleAdd(F1,F2):
> > res = add(noUnit(F1),noUnit(F2))
> > return res
> >
> > The following error occurs:
> >
> > "Making the widget component
> > java.lang.NullPointerException"
> >
> >
> >
> > ******************
> > Stack trace:
> > java.lang.NullPointerException
> > at 
> > ucar.unidata.idv.control.GridDisplayControl.getDataRangeInColorUnits(GridDisplayControl.java:264)
> > at 
> > ucar.unidata.idv.control.GridDisplayControl.getInitialRange(GridDisplayControl.java:233)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.getRange(DisplayControlImpl.java:10001)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.getRangeForColorTable(DisplayControlImpl.java:10029)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.getControlWidgets(DisplayControlImpl.java:7588)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.getControlWidgets(PlanViewControl.java:1543)
> > at 
> > ucar.unidata.idv.control.ContourPlanViewControl.getControlWidgets(ContourPlanViewControl.java:218)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.doMakeWidgetComponent(DisplayControlImpl.java:7483)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.doMakeContents(PlanViewControl.java:1498)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.doMakeWindow(DisplayControlImpl.java:4266)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1141)
> > at 
> > ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986)
> > at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:911)
> > at ucar.unidata.util.Misc$3.run(Misc.java:1249)
> >
> >
> >
> 


Ticket Details
===================
Ticket ID: DIZ-849299
Department: Support IDV
Priority: Normal
Status: Open