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I'm fairly new to Swift programming so I might be overlooking something, but I'm puzzled why the following code doesn't properly insert a row in a DataFrame. The goal is to move a row at a given index to a new index. I would normally: Copy the row that I want to move Remove the row from the original dataset Insert the copy to the new position The CSV I'm using is from Wikipedia: Year,Make,Model,Description,Price 1997,Ford,E350,"ac, abs, moon",3000.00 1999,Chevy,"Venture ""Extended Edition""","",4900.00 1999,Chevy,"Venture ""Extended Edition, Very Large""","",5000.00 1996,Jeep,Grand Cherokee,"MUST SELL! air, moon roof, loaded",4799.00 My code (Swift playground): import Foundation import TabularData let fileUrl = Bundle.main.url(forResource: "data", withExtension: "csv") let options = CSVReadingOptions(hasHeaderRow: true, delimiter: ",") var dataFrame = try! DataFrame(contentsOfCSVFile: fileUrl!, options: options) print("Original data") print(dataFrame) let rowToMove: Int = 2 let row = dataFrame.rows[rowToMove] print("Row to move") print(row) dataFrame.removeRow(at: rowToMove) print("After removing") print(dataFrame) dataFrame.insert(row: row, at: 0) print("After inserting") print(dataFrame) This results in the following: Original data ┏━━━┳━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┓ ┃ ┃ Year ┃ Make ┃ Model ┃ Description ┃ Price ┃ ┃ ┃ <Int> ┃ <String> ┃ <String> ┃ <String> ┃ <Double> ┃ ┡━━━╇━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━┩ │ 0 │ 1,997 │ Ford │ E350 │ ac, abs, moon │ 3,000.0 │ │ 1 │ 1,999 │ Chevy │ Venture "Extended Edition" │ │ 4,900.0 │ │ 2 │ 1,999 │ Chevy │ Venture "Extended Edition, Very Large" │ │ 5,000.0 │ │ 3 │ 1,996 │ Jeep │ Grand Cherokee │ MUST SELL! air, moon roof, loaded │ 4,799.0 │ └───┴───────┴──────────┴────────────────────────────────────────┴───────────────────────────────────┴──────────┘ 4 rows, 5 columns Row to move ┏━━━┳━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━┓ ┃ ┃ Year ┃ Make ┃ Model ┃ Description ┃ Price ┃ ┃ ┃ <Int> ┃ <String> ┃ <String> ┃ <String> ┃ <Double> ┃ ┡━━━╇━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━┩ │ 2 │ 1,999 │ Chevy │ Venture "Extended Edition, Very Large" │ │ 5,000.0 │ └───┴───────┴──────────┴────────────────────────────────────────┴─────────────┴──────────┘ 1 row, 5 columns After removing ┏━━━┳━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┓ ┃ ┃ Year ┃ Make ┃ Model ┃ Description ┃ Price ┃ ┃ ┃ <Int> ┃ <String> ┃ <String> ┃ <String> ┃ <Double> ┃ ┡━━━╇━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━┩ │ 0 │ 1,997 │ Ford │ E350 │ ac, abs, moon │ 3,000.0 │ │ 1 │ 1,999 │ Chevy │ Venture "Extended Edition" │ │ 4,900.0 │ │ 2 │ 1,996 │ Jeep │ Grand Cherokee │ MUST SELL! air, moon roof, loaded │ 4,799.0 │ └───┴───────┴──────────┴────────────────────────────┴───────────────────────────────────┴──────────┘ 3 rows, 5 columns After inserting ┏━━━┳━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┓ ┃ ┃ Year ┃ Make ┃ Model ┃ Description ┃ Price ┃ ┃ ┃ <Int> ┃ <String> ┃ <String> ┃ <String> ┃ <Double> ┃ ┡━━━╇━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━┩ │ 0 │ 1,999 │ Chevy │ │ │ 5,000.0 │ │ 1 │ 1,997 │ Ford │ E350 │ ac, abs, moon │ 3,000.0 │ │ 2 │ 1,996 │ Jeep │ Grand Cherokee │ MUST SELL! air, moon roof, loaded │ 4,799.0 │ │ 3 │ nil │ nil │ nil │ nil │ nil │ └───┴───────┴──────────┴────────────────────────────────────────┴───────────────────────────────────┴──────────┘ 4 rows, 5 columns Everything is fine up until inserting. I spot a few issues: A row gets deleted (original data row 1) A row filled with nil's is added (at index 3) the row I want to insert isn't properly inserted (notice how the 'model' text has gone). I assume I'm missing something - does it have to do with the row copy keeping its index (2)? How can I fix this?