**'cern.colt.matrix.tlong.algo.LongSorting'**Java class

## Class LongSorting

- java.lang.Object
- cern.colt.PersistentObject
- cern.colt.matrix.tlong.algo.LongSorting

- All Implemented Interfaces:
- Serializable, Cloneable

public class LongSortingextends PersistentObject

Matrix quicksorts and mergesorts. Use idioms like`Sorting.quickSort.sort(...)`and`Sorting.mergeSort.sort(...)`.This is another case demonstrating one primary goal of this library: Delivering easy to use, yet very efficient APIs. The sorts return convenient

*sort views*. This enables the usage of algorithms which scale well with the problem size: For example, sorting a 1000000 x 10000 or a 1000000 x 100 x 100 matrix performs just as fast as sorting a 1000000 x 1 matrix. This is so, because internally the algorithms only move around integer indexes, they do not physically move around entire rows or slices. The original matrix is left unaffected.The quicksort is a derivative of the JDK 1.2 V1.26 algorithms (which are, in turn, based on Bentley's and McIlroy's fine work). The mergesort is a derivative of the JAL algorithms, with optimisations taken from the JDK algorithms. Mergesort is

*stable*(by definition), while quicksort is not. A stable sort is, for example, helpful, if matrices are sorted successively by multiple columns. It preserves the relative position of equal elements.- See Also:
`GenericSorting`

,`Sorting`

,`Arrays`

, Serialized Form

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