[source] # Column Picker An extractor that wraps another iterator and selects and reorders the columns of the data table according to the keys specified by the user. The key of a column may either be a string or a column number (integer) depending on the way the columns are indexed in the base iterator. **Interfaces:** [Extractor](api.md) ## Parameters | # | Name | Default | Type | Description | |---|---|---|---|---| | 1 | iterator | | Traversable | The base iterator. | | 2 | keys | | array | The string and/or integer keys of the columns to pick and reorder from the table | ## Example ```php use Rubix\ML\Extractors\ColumnPicker; use Rubix\ML\Extractors\CSV; $extractor = new ColumnPicker(new CSV('example.csv', true), [ 'attitude', 'texture', 'class', 'rating', ]); ``` ## Additional Methods This extractor does not have any additional methods.