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Simplified a check in _getitem_RepMatrix #26590

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Simplified a check in _getitem_RepMatrix #26590

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3 changes: 1 addition & 2 deletions sympy/matrices/repmatrix.py
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Original file line number Diff line number Diff line change
Expand Up @@ -957,8 +957,7 @@ def _getitem_RepMatrix(self, key):
return self._rep.getitem_sympy(index_(i), index_(j))
except (TypeError, IndexError):
if (isinstance(i, Expr) and not i.is_number) or (isinstance(j, Expr) and not j.is_number):
if ((j < 0) is True) or ((j >= self.shape[1]) is True) or\
((i < 0) is True) or ((i >= self.shape[0]) is True):
if (j < 0) or (j >= self.shape[1]) or (i < 0) or (i >= self.shape[0]):
Comment on lines 959 to +960
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This change does not work for symbolic indices:

In [54]: i, j = symbols('i, j')

In [55]: M = Matrix([[1, 2], [3, 4]])

In [56]: M[i,j]
Out[56]: 
⎛⎡1  2⎤⎞      
⎜⎢    ⎥⎟[i, j]
⎝⎣3  4⎦⎠      

In [57]: M[i,j].subs({i:1,j:0})
Out[57]: 3

raise ValueError("index out of boundary")
from sympy.matrices.expressions.matexpr import MatrixElement
return MatrixElement(self, i, j)
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