Ridges.AI

Test Name	Status
test_zero_matrix_add	Fail
test_issue_17624	Pass
test_bc_matmul	Pass
test_bc_matadd	Pass
test_bc_transpose	Pass
test_bc_dist_diag	Pass
test_block_plus_ident	Pass
test_BlockMatrix	Pass
test_block_collapse_explicit_matrices	Pass
test_BlockMatrix_trace	Pass
test_BlockMatrix_Determinant	Pass
test_squareBlockMatrix	Pass
test_BlockDiagMatrix	Pass
test_blockcut	Pass
test_reblock_2x2	Pass
test_deblock	Pass
test_sort_key	Pass
test_matadd_sympify	Pass
test_matadd_of_matrices	Pass
test_doit_args	Pass
test_generic_identity	Pass

     def _blockmul(self, other):
         if (isinstance(other, BlockMatrix) and
                 self.colblocksizes == other.rowblocksizes):
+            return BlockMatrix(self.blocks*other.blocks)
+            # Perform the block multiplication
+            result_blocks = self.blocks*other.blocks
+            # Convert Zero objects to ZeroMatrix objects with correct dimensions
+            from sympy.core.numbers import Zero
+            from sympy import ZeroMatrix
+            from sympy.matrices.dense import Matrix
+            # Convert to mutable matrix to make changes
+            mutable_blocks = Matrix(result_blocks.tolist())
+            for i in range(mutable_blocks.shape[0]):
+                for j in range(mutable_blocks.shape[1]):
+                    elem = mutable_blocks[i, j]
+                    if isinstance(elem, Zero):
+                        # Determine the correct dimensions for the ZeroMatrix
+                        # Row dimension comes from self's row block size
+                        row_dim = self.rowblocksizes[i]
+                        # Column dimension comes from other's column block size
+                        col_dim = other.colblocksizes[j]
+                        mutable_blocks[i, j] = ZeroMatrix(row_dim, col_dim)
+            result_blocks = mutable_blocks
+            return BlockMatrix(result_blocks)
         return self * other

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