org.grouplens.lenskit.util.table

Interface Column

All Superinterfaces:

Collection<Object>, Iterable<Object>, List<Object>

public interface Column
extends List<Object>

A view of a column of a table.

Method Summary

Modifier and Type	Method and Description
double	average() Get the average of this column.
double	sum() Get the sum of this column.

Methods inherited from interface java.util.List

add, add, addAll, addAll, clear, contains, containsAll, equals, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, replaceAll, retainAll, set, size, sort, spliterator, subList, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

sum

double sum()

Get the sum of this column. Null entries result in a sum of NaN.

Returns:

The column's sum.

Throws:

IllegalArgumentException - if there are any non-null, non-numeric entries in the table.

average

double average()

Get the average of this column. Null entries and empty tables result in NaN.

Returns:

The column's average.

Throws:

IllegalArgumentException - if there are any non-null, non-numeric entries in the table.