Package org.grouplens.lenskit.vectors

Sparse vectors and their operations.

See: Description

Class Summary

Class	Description
ImmutableSparseVector	Immutable sparse vectors.
ImmutableVec	Deprecated Use vectorz instead.
MutableSparseVector	Mutable version of sparse vector.
MutableVec	Deprecated Use vectorz instead.
SparseVector	Read-only interface to sparse vectors.
Vec	Deprecated Use vectorz instead.
VectorEntry	An entry in a sparse vector.
Vectors	Utility methods for interacting with vectors.

Enum Summary

Enum	Description
VectorEntry.State	The state of an entry in a sparse vector.

Package org.grouplens.lenskit.vectors Description

Sparse vectors and their operations. Sparse vectors map arbitrary long keys to values sparsely and efficiently. The keys can be negative.

Sparse vectors come in three flavors. Read-only vectors (SparseVector); this type is the base of the remaining types for each vector, and provides a read-only interface to the vector. Immutable vectors (ImmutableSparseVector) are immutable and cannot be changed once created. They can also be freely shared between threads. Finally, mutable vectors (MutableSparseVector) are mutable and not thread-safe.

This design allows read-only operations to be performed on any type of vector, while allowing components to specifically work with and store vectors guaranteed to be immutable.

The Vectors class provides utility methods for working with vectors.

See Also:

Sparse Vector tutorial