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[IDV #JBN-701347]: Error when trying exp(field)

> Hi Yuan,
> 
> Thanks for your explanation of my error.  I have found that using the **
> operator seems to work.  So, for example, 2.718**EQPT.  Is this the best
> way to perform something like e^EQPT on the whole 3D grid?  Thanks for your
> help,
> 
> Paul
> 

Paul,
    Again, I will not trust the result of 2.718**EQRT since the EQRT is a visad 
object. You need to verify the result by create the value plot.

I will try to extract the value from EQRT and do the calculation, something 
like:

def expTest(data):
    """change values in data to newvalue """
    newData = data.clone();
    if (GridUtil.isTimeSequence(newData)):
        for t in range(newData.getDomainSet().getLength()):
            rangeObject = newData.getSample(t)
            values = rangeObject.getFloats(0);
            for i in range(len(values)):
               for j in range(len(values[0])):
                           newValue = 2.718**values[i][j];
                           values[i][j] = newValue;                           
            rangeObject.setSamples(values,1);
    else:
        rangeObject = newData;
        values = rangeObject.getFloats(0);
        for i in range(len(values)):
          for j in range(len(values[0])):
             newValue = 2.718**values[i][j];
             values[i][j] = newValue;   
        rangeObject.setSamples(values,1);
    return newData;



This formula has not been tested, you need to do it yourself.

Yuan
> 
> On 17 December 2013 10:07, Unidata IDV Support <address@hidden
> > wrote:
> 
> > > Hi Unidata Support,
> > >
> > > Thanks for getting back to my so promptly.  A test formula I was using is
> > > when this error occurred is:
> > >
> > > def testExp(EQPT):
> > > return exp(noUnit(EQPT.clone()))
> > >
> > > I think the problem has something to do with stripping the units with
> > > noUnit().
> > >
> > > Regards,
> > >
> > > Paul
> >
> > Paul,
> >      The problem is that the input of your formula is a visad object, and
> > Jython can not handle this kind of
> > object. In the IDV, we handle this kind of calculation in Java, extract
> > the numeric value from the visad object and
> > do the calculation, and then construct a new visad object and return to
> > the IDV. But,
> > we don't have exp formula yet.
> >
> >
> > Yuan
> > >
> > >
> > address@hidden
> > > > wrote:
> > >
> > > > > Full Name: Paul Graham
> > > > > Email Address: address@hidden
> > > > > Organization: Weathersim
> > > > > Package Version: 4.1u1 build date:2013-09-25 07:05 UTC
> > > > > Operating System: Linux
> > > > > Hardware: Java: home: /usr/local/bin/IDV_4.1u1/jre version: 1.6.0_41
> > > > j3d:1.5.2 fcs (build4)
> > > > > Description of problem: Not sure as to why the IDV gives this error
> > when
> > > > trying to use the exponential function on a field:
> > > > >
> > > > > Creating display: Color-Filled Contour Plan View
> > > > > visad.UnitException: visad.UnitException: FlatField: RangeUnits must
> > be
> > > > convertable with RangeType default Units
> > > > > FlatField: RangeUnits must be convertable with RangeType default
> > Units
> > > >
> > > > Paul,
> > > >     Could you provide us the formula you were trying?
> > > >
> > > >
> > > > Yuan
> > > > >
> > > > > ******************
> > > > > Stack trace:
> > > > > visad.UnitException: FlatField: RangeUnits must be convertable with
> > > > RangeType default Units
> > > > > at visad.FlatField.<init>(FlatField.java:412)
> > > > > at visad.FlatField.cloneFloat(FlatField.java:5605)
> > > > > at visad.FlatField.unary(FlatField.java:3744)
> > > > > at visad.FieldImpl.unary(FieldImpl.java:906)
> > > > > at visad.DataImpl.unary(DataImpl.java:485)
> > > > > at visad.DataImpl.exp(DataImpl.java:662)
> > > > > at visad.python.JPythonMethods.exp(JPythonMethods.java:942)
> > > > > 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:387)
> > > > > at org.python.core.PyObject.__call__(PyObject.java:391)
> > > > > at org.python.pycode._pyx283.hailRiskII$15(<string>:240)
> > > > > at org.python.pycode._pyx283.call_function(<string>)
> > > > > at org.python.core.PyTableCode.call(PyTableCode.java:165)
> > > > > at org.python.core.PyBaseCode.call(PyBaseCode.java:149)
> > > > > at org.python.core.PyFunction.__call__(PyFunction.java:327)
> > > > > at org.python.pycode._pyx285.f$0(<string>:1)
> > > > > at org.python.pycode._pyx285.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:787)
> > > > > 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:206)
> > > > > at
> > > >
> > ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:163)
> > > > > at
> > > >
> > ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:144)
> > > > > at
> > > >
> > ucar.unidata.idv.control.GridDisplayControl.doMakeDataInstance(GridDisplayControl.java:284)
> > > > > at
> > > >
> > ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3224)
> > > > > at
> > > >
> > ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:3206)
> > > > > 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:1421)
> > > > > at
> > > >
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1106)
> > > > > 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:1251)
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > Ticket Details
> > > > ===================
> > > > Ticket ID: JBN-701347
> > > > Department: Support IDV
> > > > Priority: Normal
> > > > Status: Open
> > > >
> > > >
> > >
> > >
> > > --
> > > Paul Graham
> > > Email: address@hidden
> > > Mobile: 0403003784
> > >
> > >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: JBN-701347
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> >
> 
> 
> --
> Paul Graham
> Email: address@hidden
> Mobile: 0403003784
> 
> 

Ticket Details
===================
Ticket ID: JBN-701347
Department: Support IDV
Priority: Normal
Status: Closed