# *(_:_:) Creates a column of doubles by multiplying each element in the first column by the corresponding element in the second column. ``` static func * (a: MLDataColumn, b: MLDataColumn) -> MLDataColumn ``` ## Parameters `a` A column of doubles. `b` A column of doubles. ## Return Value A new column of doubles if the columns are the same size; otherwise an invalid column. --- 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)