org.apache.mahout.math
Interfaces 
Matrix
Vector
Vector.Element
VectorIterable
Classes 
AbstractMatrix
AbstractVector
Algebra
DenseMatrix
DenseVector
GenericPermuting
MatrixSlice
MatrixVectorView
MatrixView
NamedVector
OrthonormalityVerifier
QRDecomposition
RandomAccessSparseVector
SequentialAccessSparseVector
SingularValueDecomposition
SparseColumnMatrix
SparseMatrix
SparseRowMatrix
VectorList
VectorView
Exceptions 
CardinalityException
IndexException
UnboundLabelException