[Octave-bug-tracker] [bug #57382] [octave forge](symbolic) fplot not working with syms

[Juan Pablo Carbajal]

URL:
  <https://savannah.gnu.org/bugs/?57382>

                 Summary: [octave forge](symbolic) fplot not working with syms
                 Project: GNU Octave
            Submitted by: juanpi
            Submitted on: Sun 08 Dec 2019 10:32:39 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: juanpi
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: GNU/Linux

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Details:

The Matlab function fplot works with symbolic functions as well.
For example, this code


syms x
f(x)=x^2;
fplot(f(x))


plots the parabola on the dafault [-5,5] interval.

symbolic 2.8.0 on GNu Octave 5.1.1 produces


error: isalnum: not defined for class
error: called from
    fplot at line 100 column 3





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