BUG: change the type of @ result from MatrixVariable to MatrixExpr
#1059
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Implements the __matmul__ method for MatrixExpr, enabling matrix multiplication using the @ operator and ensuring the result is returned as a MatrixExpr instance.
Adds tests to verify that matrix multiplication returns MatrixExpr instead of MatrixVariable for various input shapes.
Replaces isinstance checks with type() comparisons for MatrixExpr in matrix matmul return type tests to ensure exact type matching.
Zeroto521
commented
Aug 19, 2025
Corrects the shapes of matrix variables in test_matrix_matmul_return_type to ensure proper 2D matrix multiplication and type assertion.
Opt-Mucca
approved these changes
Sep 1, 2025
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fix #1058