{"record":{"id":"63006662adcb8f98","repo":"TheAlgorithms/Python","slug":"column-must-be-equal-in-length-to-the-other-column","errorCode":null,"errorMessage":"Column must be equal in length to the other columns in the matrix","messagePattern":"Column must be equal in length to the other columns in the matrix","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"matrix/matrix_class.py","lineNumber":275,"sourceCode":"            raise ValueError(\n                \"Row must be equal in length to the other rows in the matrix\"\n            )\n        if position is None:\n            self.rows.append(row)\n        else:\n            self.rows = [*self.rows[0:position], row, *self.rows[position:]]\n\n    def add_column(self, column: list[int], position: int | None = None) -> None:\n        type_error = TypeError(\n            \"Column must be a list containing all ints and/or floats\"\n        )\n        if not isinstance(column, list):\n            raise type_error\n        for value in column:\n            if not isinstance(value, (int, float)):\n                raise type_error\n        if len(column) != self.num_rows:\n            raise ValueError(\n                \"Column must be equal in length to the other columns in the matrix\"\n            )\n        if position is None:\n            self.rows = [self.rows[i] + [column[i]] for i in range(self.num_rows)]\n        else:\n            self.rows = [\n                [*self.rows[i][0:position], column[i], *self.rows[i][position:]]\n                for i in range(self.num_rows)\n            ]\n\n    # MATRIX OPERATIONS\n    def __eq__(self, other: object) -> bool:\n        if not isinstance(other, Matrix):\n            return NotImplemented\n        return self.rows == other.rows\n\n    def __ne__(self, other: object) -> bool:\n        return not self == other","sourceCodeStart":257,"sourceCodeEnd":293,"githubUrl":"https://github.com/TheAlgorithms/Python/blob/f5988cc09713315817df6a7e327e258013a94440/matrix/matrix_class.py#L257-L293","documentation":"Error \"Column must be equal in length to the other columns in the matrix\" thrown in TheAlgorithms/Python.","triggerScenarios":"Thrown at matrix/matrix_class.py:275 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Set the column to the same length as the existing columns of the matrix."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"f5988cc09713315817df6a7e327e258013a94440","analyzedAt":"2026-08-14T17:30:07.041Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}