Aggregate Columns ================= Compute a sum, max, min ... of selected columns. **Inputs** - Data: input dataset **Outputs** - Data: extended dataset **Aggregate Columns** outputs an aggregation of selected columns, for example a sum, min, max, etc. ![](images/AggregateColumns.png) 1. Selected attributes. 2. Operator for aggregation: - sum - product - min - max - mean - variance - median 3. Set the name of the computed attribute. 4. If *Apply automatically* is ticked, changes will be communicated automatically. Alternatively, click *Apply*. Example ------- We will use iris data from the [File](../data/file.md) widget for this example and connect it to **Aggregate Columns**. Say we wish to compute a sum of *sepal_length* and *sepal_width* attributes. We select the two attributes from the list. ![](images/AggregateColumns-Example.png)