[Octave-bug-tracker] [bug #57726] double() not working on the symbolic expressions

[Jing-Chen Peng]

URL:
  <https://savannah.gnu.org/bugs/?57726>

                 Summary: double() not working on the symbolic expressions
                 Project: GNU Octave
            Submitted by: jcpeng
            Submitted on: Sun 02 Feb 2020 03:49:13 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: jcpeng
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Microsoft Windows

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Details:

I was messing around with the symbolic package and wanted to evaluate a
symbolic expression with subs(), vpa(), and double(), but vpa() in octave
returns an equality object which can't be converted to a complex or floating
point number directly in python.

The new python code for double():
  cmd = { '(x,) = _ins'
          'if x == zoo:'  % zoo -> Inf + Infi
          '    return (float(sp.oo), float(sp.oo))'
          'if x == nan:'
          '    return (float(nan), 0.0)'
          % Adding check for Eq type to evaluate vpa()'d symbolic
          %     variables.
          'if isinstance(x, Eq):'
          '    x = complex(x.rhs)'
          '    return (x.real, x.imag)'
          'x = complex(x)'
          'return (x.real, x.imag)'
        };





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