| Interface | Description | 
|---|---|
| DistributedMatrix | 
 Represents a distributively stored matrix backed by one or more RDDs. 
 | 
| Class | Description | 
|---|---|
| BlockMatrix | 
 Represents a distributed matrix in blocks of local matrices. 
 | 
| CoordinateMatrix | 
 Represents a matrix in coordinate format. 
 | 
| IndexedRow | 
 Represents a row of  
IndexedRowMatrix. | 
| IndexedRowMatrix | 
 Represents a row-oriented  
DistributedMatrix with
 indexed rows. | 
| MatrixEntry | 
 Represents an entry in a distributed matrix. 
 | 
| RowMatrix | 
 Represents a row-oriented distributed Matrix with no meaningful row indices. 
 |