[Octave-bug-tracker] [bug #48591] function double on java objects.

[Ernst Reissner]

URL:
  <http://savannah.gnu.org/bugs/?48591>

                 Summary: function double on java objects. 
                 Project: GNU Octave
            Submitted by: ernstreissner
            Submitted on: Fri 22 Jul 2016 12:06:57 AM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.3
        Operating System: Any

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Details:


http://de.mathworks.com/help/matlab/matlab_external/handling-data-returned-from-a-java-method.html

shows that in Matlab function double may be applied to java objects. 

For Octave: 

bd=javaObject('java.math.BigDecimal',42)
bd =

<Java object: java.math.BigDecimal>

octave:26> bd.doubleValue()
ans =  42
octave:27> class(ans)
ans = double
octave:28> double(bd)
error: invalid conversion from octave_java to scalar

this should not be. 
In fact, double(bd) should invoke bd.doubleValue() 
as it is an instance of java.lang.Number. 






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