[IDV #JHR-169833]: Cannot create display from formula

Greetings!

Try using this for your formula:

sub(a,b) / 350

I think because the grids are on two different vertical levels, you need to use 
the
sub(a,b) routine to do the subtraction.

Cheers!

Sean

> No problem Sean.
> I've uploaded the two datasets onto motherlode in two separate uploads 
> addressed to you. The variables are:
> (a) temperature at the 850mb level (850temp.nc)
> (b) temperature at the 500mb level (500temp.nc)
> which relate to
> (a-b)/350
> The domain and times are identical.
> Thanks for your time.
> 
> ________________________________________
> From: Unidata IDV Support [address@hidden]
> Sent: Tuesday, 15 January 2013 3:38 AM
> To: Mr Alister Hawksford
> Cc: address@hidden
> Subject: [IDV #JHR-169833]: Cannot create display from formula
> 
> Greetings Alister,
> 
> Is there any way we could get a sample of your data to see exactly what is 
> going on? Also,
> could you tell us which variables you are subtracting? If you don't mind 
> sending some
> example data, please upload it here:
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> Thanks!
> 
> Sean
> 
> > Full Name: Alister Hawksford
> > Email Address: address@hidden
> > Organization: Bureau of Meteorology
> > Package Version: 3.1u1 build date:2012-11-30 17:36 UTC
> > Operating System: Windows Vista
> > Hardware: Java: home: C:\Program Files\IDV_3.1u1\jre version: 1.6.0_31 
> > j3d:1.5.2 fcs (build4)
> > Description of problem: Creating display: Color-Filled Contour Plan View
> > visad.SetException: visad.SetException: Gridded3DSet.valueToGrid: 
> > ManifoldDimension must be 3
> > Gridded3DSet.valueToGrid: ManifoldDimension must be 3
> >
> > To whom it may concern,
> > I have been following the Unidata instructions for formula creation 
> > (http://www.unidata.ucar.edu/software/idv/docs/workshop/formulas/SimpleFormulas.html)
> >  and I have not been able to display my formula as follows:
> > (a-b)/(850-500)
> > Could you please explain what the above error code means and how I might 
> > solve it?
> > Thank you for your help.
> >
> > ******************
> > Stack trace:
> > visad.SetException: Gridded3DSet.valueToGrid: ManifoldDimension must be 3
> > at visad.Gridded3DSet.valueToGrid(Gridded3DSet.java:1070)
> > at visad.Gridded3DSet.valueToIndex(Gridded3DSet.java:418)
> > at visad.FlatField.resample(FlatField.java:4737)
> > at visad.FlatField.binary(FlatField.java:2085)
> > at visad.FieldImpl.binary(FieldImpl.java:836)
> > at visad.DataImpl.binary(DataImpl.java:139)
> > at visad.DataImpl.subtract(DataImpl.java:192)
> > at visad.DataImpl.__sub__(DataImpl.java:1400)
> > 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)
> > at 
> > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
> > at 
> > org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
> > at org.python.core.PyObject.__call__(PyObject.java:404)
> > at org.python.core.PyObject.__call__(PyObject.java:408)
> > at org.python.core.PyMethod.__call__(PyMethod.java:124)
> > at org.python.core.PyMethod.__call__(PyMethod.java:115)
> > at org.python.core.PyObjectDerived.__sub__(PyObjectDerived.java:187)
> > at org.python.core.PyObject._basic_sub(PyObject.java:2119)
> > at org.python.core.PyObject._sub(PyObject.java:2105)
> > at org.python.pycode._pyx109.f$0(<string>:1)
> > at org.python.pycode._pyx109.call_function(<string>)
> > at org.python.core.PyTableCode.call(PyTableCode.java:165)
> > at org.python.core.PyCode.call(PyCode.java:18)
> > at org.python.core.Py.runCode(Py.java:1261)
> > at org.python.core.__builtin__.eval(__builtin__.java:484)
> > at org.python.core.__builtin__.eval(__builtin__.java:488)
> > at org.python.util.PythonInterpreter.eval(PythonInterpreter.java:190)
> > at ucar.unidata.data.DerivedDataChoice.getData(DerivedDataChoice.java:782)
> > at ucar.unidata.data.DataChoice.getData(DataChoice.java:637)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:243)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:207)
> > at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:205)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:162)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:143)
> > at 
> > ucar.unidata.idv.control.GridDisplayControl.doMakeDataInstance(GridDisplayControl.java:284)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3176)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:3158)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:641)
> > at 
> > ucar.unidata.idv.control.ContourPlanViewControl.setData(ContourPlanViewControl.java:194)
> > at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:471)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1419)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1102)
> > 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:1250)
> >
> >
> >
> 
> Ticket Details
> ===================
> Ticket ID: JHR-169833
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 
> 
> 

Ticket Details
===================
Ticket ID: JHR-169833
Department: Support IDV
Priority: Normal
Status: Open