Status: Valid
Owner: ----
CC: [email protected]
Labels: Type-Defect Priority-Medium Matrices
New issue 3495 by [email protected]: Matrices .args and .shape should
contain SymPy types
http://code.google.com/p/sympy/issues/detail?id=3495
Matrices .args and .shape should be tuples whose members are SymPy types.
Currently, .args seem to obey this, but there is at least one case
where .shape does not:
from sympy import *
A = ImmutableMatrix(2, 2, [0, 1, 1, 0])
AA = MatPow(A, 2)
ImmutableMatrix(AA)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy/matrices/immutable.py", line 40, in __new__
return cls._new(*args, **kwargs)
File "sympy/matrices/immutable.py", line 33, in _new
*args, **kwargs)
File "sympy/matrices/matrices.py", line 137, in _handle_creation_inputs
return args[0].rows, args[0].cols, args[0].as_explicit()._mat
File "sympy/matrices/expressions/matexpr.py", line 199, in as_explicit
for i in range(self.rows)])
File "sympy/matrices/expressions/matexpr.py", line 168, in __getitem__
return self._entry(i, j)
File "sympy/matrices/expressions/matpow.py", line 36, in _entry
*[self.base for k in range(self.exp)])._entry(i, j)
File "sympy/matrices/expressions/matmul.py", line 51, in _entry
if X.shape[1].is_Number:
AttributeError: 'int' object has no attribute 'is_Number'
AA.shape
(2, 2)
map(type, AA.shape)
[<type 'int'>, <type 'int'>]
This came up in the Hadamard PR at https://github.com/sympy/sympy/pull/1608
where the same error occurred in calculating the Hadamard product of two
actual matrices with ImmutableMatrix(HadamardProduct(A, B)).
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