# init(column:) Creates a new column of arrays of doubles from a given column whose elements can be converted to an array of doubles. ``` init(column: MLDataColumn) where T : MLDataValueConvertible ``` ## Parameters `column` An [`MLDataColumn`](/documentation/CreateML/MLDataColumn) of elements convertible to an of . ## Discussion Use this initializer to create a column of arrays of doubles from another column. Start by creating a column that is convertible to a column of arrays of doubles. ```swift let doubleArrayString = "[1.0, 2.0, 3.0]" let doubleArrayString2 = "[4.0, 5.0, 6.0]" let stringsColumn = MLDataColumn([doubleArrayString, doubleArrayString2]) print(stringsColumn) // Prints ["[1.0, 2.0, 3.0]", "[4.0, 5.0, 6.0]"] ``` Then use [`init(column:)`](/documentation/CreateML/MLDataColumn/init(column:)-23pmx) to convert the column to a column of arrays of doubles. ```swift let doubleArrayColumn = MLDataColumn<[Double]>(column: stringsColumn) print(doubleArrayColumn) // Prints [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]] ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)