[Octave-bug-tracker] [bug #58869] [octave forge] (symbolic) Failure in matrix division

[Rafael Laboissiere]

URL:
  <https://savannah.gnu.org/bugs/?58869>

                 Summary: [octave forge] (symbolic) Failure in matrix division
                 Project: GNU Octave
            Submitted by: rlaboiss
            Submitted on: Sun 02 Aug 2020 10:48:55 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: other
         Discussion Lock: Any
        Operating System: GNU/Linux

    _______________________________________________________

Details:

The following is failing with version 2.9.0 of the symbolic package and with
SymPy 1.6.1:


octave:1> pkg load symbolic
octave:2> sym (eye (2)) / sym ([1 2; 3 4])
Symbolic pkg v2.9.0: Python communication link active, SymPy v1.6.1.
error: Python exception: TypeError: unsupported operand type(s) for /: 'One'
and 'MutableDenseMatrix'
    occurred at line 1 of the Python code block:
    return _ins[0]/_ins[1],
error: called from
    pycall_sympy__ at line 178 column 7
    mrdivide at line 79 column 5


The bug seems to come from SymPy itself:


>>> from sympy import *
>>> eye (2) / Matrix ([[1, 2], [3, 4]])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/sympy/core/decorators.py", line 127, in
binary_op_wrapper
    return func(self, other)
  File "/usr/lib/python3/dist-packages/sympy/matrices/common.py", line 2712,
in __truediv__
    return self.__div__(other)
  File "/usr/lib/python3/dist-packages/sympy/core/decorators.py", line 127, in
binary_op_wrapper
    return func(self, other)
  File "/usr/lib/python3/dist-packages/sympy/matrices/common.py", line 2452,
in __div__
    return self * (self.one / other)
TypeError: unsupported operand type(s) for /: 'One' and 'MutableDenseMatrix'


BTW, this problem cause the failure of many unit tests in
inst/@sym/mrdivide.m.




    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?58869>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/