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# expand(columnNamed:to:)

Creates a new data table where duplicate row values in the given column
are condensed into a new sequence-type column.

```
func expand(columnNamed: String, to: String) -> MLDataTable
```

## Parameters

`columnNamed`

The name of the column to expand.

`to`

The name of the new expanded column.

## Return Value

A new data table.

## Discussion

This function performs the inverse of [`condense(columnNamed:to:)`](/documentation/CreateML/MLDataTable/condense(columnNamed:to:)).

---

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