Package tech.tablesaw.aggregate

Class PivotTable

java.lang.Object

tech.tablesaw.aggregate.PivotTable

public class PivotTable
extends Object

PivotTable is used to 'rotate' a source table such that it is summarized on the values of some column. As implemented here, you supply: - a "key" categorical column from which the primary grouping is created, there will be one on each row of the result - a second categorical column for which a subtotal is created; this produces n columns on each row of the result - one column for each unique value - a numeric column that provides the values to be summarized - an aggregation function that defines what operation is performed on the values in the subgroups

Constructor Summary

Constructors

Constructor	Description
PivotTable()

Method Summary

Modifier and Type	Method	Description
static Table	pivot(Table table, CategoricalColumn<?> column1, CategoricalColumn<?> column2, NumericColumn<?> values, AggregateFunction<?,?> aggregateFunction)	Returns a table that is a rotation of the given table pivoted around the key columns, and filling the output cells using the values calculated by the aggregateFunction when applied to the values column grouping by the key columns

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PivotTable

public PivotTable()

Method Detail

pivot

public static Table pivot(Table table,
                          CategoricalColumn<?> column1,
                          CategoricalColumn<?> column2,
                          NumericColumn<?> values,
                          AggregateFunction<?,?> aggregateFunction)

Returns a table that is a rotation of the given table pivoted around the key columns, and filling the output cells using the values calculated by the aggregateFunction when applied to the values column grouping by the key columns

Parameters:

table - The table that provides the data to be pivoted

column1 - A "key" categorical column from which the primary grouping is created. There will be one on each row of the result

column2 - A second categorical column for which a subtotal is created; this produces n columns on each row of the result

values - A numeric column that provides the values to be summarized

aggregateFunction - function that defines what operation is performed on the values in the subgroups

Returns:

A new, pivoted table