[IDV #JKV-615810]: Formulas crash when using two Netcdf

> Full Name: Francisco Ferri
> Email Address: address@hidden
> Organization: Museo Nacional de Ciencias Naturales
> Package Version: 2.9u3 build date:2011-01-14 00:05 UTC
> Operating System: Windows XP
> Hardware: Java: home: C:\Program Files\IDV_2.9u3\jre version: 1.6.0_20 
> j3d:1.5.2 fcs (build4)
> Description of problem:
> 
> Creating display: Image Display
> visad.UnitException: visad.UnitException
> org.python.core.PyException
> 
> When a formula uses two parameters from different Netcdf files, formula
> invariably crashes.

When you used two different parameters with different unit in the formula, you 
need to make sure units of two variables are meaningful to the IDV. I am 
guessing this is the cause of your problem. For example in the formula a + b, 
if a is temperature with unit K, and b is pressure with unit Pa, and the IDV 
will throw unit exception. The solution is to call the formula inside the 
formula to change the unit, a + b will be noUnit(a) + noUnit(b), the noUnit 
formula will remove the unit of a, and b. Let me know if you need further help.


Yuan

> 
> ******************
> Stack trace:
> Traceback (innermost last):
> File "<string>", line 1, in ?
> at visad.RealType.binary(RealType.java:473)
> 
> at visad.FunctionType.binary(FunctionType.java:270)
> 
> at visad.FunctionType.binary(FunctionType.java:270)
> 
> at visad.DataImpl.binary(DataImpl.java:138)
> 
> at visad.DataImpl.add(DataImpl.java:179)
> 
> at visad.DataImpl.__add__(DataImpl.java:1393)
> 
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> 
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> 
> at java.lang.reflect.Method.invoke(Unknown Source)
> 
> 
> visad.UnitException: visad.UnitException
> 
> 
> 


Ticket Details
===================
Ticket ID: JKV-615810
Department: Support IDV
Priority: Normal
Status: Closed