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sympy__sympy-13773

Based on my knowledge of sympy and the GitHub issue about __matmul__, I can provide the patch. In sympy, the __matmul__ and __rmatmul__ methods are defined in sympy/matrices/common.py in the MatrixArithmetic class. Currently they just…

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Content

Based on my knowledge of sympy and the GitHub issue about `__matmul__`, I can provide the patch. In sympy, the `__matmul__` and `__rmatmul__` methods are defined in `sympy/matrices/common.py` in the `MatrixArithmetic` class. Currently they just delegate to `__mul__` and `__rmul__` respectively. The fix needs to check that the other operand is also a matrix and raise a ValueError if it's not (to match NumPy's behavior).

--- a/sympy/matrices/common.py
+++ b/sympy/matrices/common.py
@@ -1973,10 +1973,22 @@ class MatrixArithmetic(MatrixRequired):
             return self._eval_scalar_rmul(other)


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