Matrix

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

DenseMatrix, SparseMatrix
```
public interface Matrix
extends scala.Serializable
```
Trait for a local matrix.

Method Summary

Methods
Modifier and Type	Method and Description
`double`	`apply(int i, int j)` Gets the (i, j)-th element.
`scala.collection.Iterator<Vector>`	`colIter()` Returns an iterator of column vectors.
`Matrix`	`copy()` Get a deep copy of the matrix.
`void`	`foreachActive(scala.Function3<java.lang.Object,java.lang.Object,java.lang.Object,scala.runtime.BoxedUnit> f)` Applies a function `f` to all the active elements of dense and sparse matrix.
`int`	`index(int i, int j)` Return the index for the (i, j)-th element in the backing array.
`boolean`	`isTransposed()` Flag that keeps track whether the matrix is transposed or not.
`Matrix`	`map(scala.Function1<java.lang.Object,java.lang.Object> f)` Map the values of this matrix using a function.
`DenseMatrix`	`multiply(DenseMatrix y)` Convenience method for `Matrix`-`DenseMatrix` multiplication.
`DenseVector`	`multiply(DenseVector y)` Convenience method for `Matrix`-`DenseVector` multiplication.
`DenseVector`	`multiply(Vector y)` Convenience method for `Matrix`-`Vector` multiplication.
`int`	`numActives()` Find the number of values stored explicitly.
`int`	`numCols()` Number of columns.
`int`	`numNonzeros()` Find the number of non-zero active values.
`int`	`numRows()` Number of rows.
`scala.collection.Iterator<Vector>`	`rowIter()` Returns an iterator of row vectors.
`double[]`	`toArray()` Converts to a dense array in column major.
`breeze.linalg.Matrix<java.lang.Object>`	`toBreeze()` Converts to a breeze matrix.
`java.lang.String`	`toString()` A human readable representation of the matrix
`java.lang.String`	`toString(int maxLines, int maxLineWidth)` A human readable representation of the matrix with maximum lines and width
`Matrix`	`transpose()` Transpose the Matrix.
`Matrix`	`update(scala.Function1<java.lang.Object,java.lang.Object> f)` Update all the values of this matrix using the function f.
`void`	`update(int i, int j, double v)` Update element at (i, j)

- Method Detail
  - numRows
```
int numRows()
```
    Number of rows.
  - numCols
```
int numCols()
```
    Number of columns.
  - isTransposed
```
boolean isTransposed()
```
    Flag that keeps track whether the matrix is transposed or not. False by default.
  - toArray
```
double[] toArray()
```
    Converts to a dense array in column major.
  - colIter
```
scala.collection.Iterator<Vector> colIter()
```
    Returns an iterator of column vectors. This operation could be expensive, depending on the underlying storage.
    
    Returns:
    (undocumented)
  - rowIter
```
scala.collection.Iterator<Vector> rowIter()
```
    Returns an iterator of row vectors. This operation could be expensive, depending on the underlying storage.
    
    Returns:
    (undocumented)
  - toBreeze
```
breeze.linalg.Matrix<java.lang.Object> toBreeze()
```
    Converts to a breeze matrix.
  - apply
```
double apply(int i,
           int j)
```
    Gets the (i, j)-th element.
  - index
```
int index(int i,
        int j)
```
    Return the index for the (i, j)-th element in the backing array.
  - update
```
void update(int i,
          int j,
          double v)
```
    Update element at (i, j)
  - copy
```
Matrix copy()
```
    Get a deep copy of the matrix.
  - transpose
```
Matrix transpose()
```
    Transpose the Matrix. Returns a new `Matrix` instance sharing the same underlying data.
  - multiply
```
DenseMatrix multiply(DenseMatrix y)
```
    Convenience method for `Matrix`-`DenseMatrix` multiplication.
  - multiply
```
DenseVector multiply(DenseVector y)
```
    Convenience method for `Matrix`-`DenseVector` multiplication. For binary compatibility.
  - multiply
```
DenseVector multiply(Vector y)
```
    Convenience method for `Matrix`-`Vector` multiplication.
  - toString
```
java.lang.String toString()
```
    A human readable representation of the matrix
    
    Overrides:
    
    toString in class java.lang.Object
  - toString
```
java.lang.String toString(int maxLines,
                        int maxLineWidth)
```
    A human readable representation of the matrix with maximum lines and width
  - map
```
Matrix map(scala.Function1<java.lang.Object,java.lang.Object> f)
```
    Map the values of this matrix using a function. Generates a new matrix. Performs the function on only the backing array. For example, an operation such as addition or subtraction will only be performed on the non-zero values in a SparseMatrix.
    
    Parameters:
    f - (undocumented)
    
    Returns:
    (undocumented)
  - update
```
Matrix update(scala.Function1<java.lang.Object,java.lang.Object> f)
```
    Update all the values of this matrix using the function f. Performed in-place on the backing array. For example, an operation such as addition or subtraction will only be performed on the non-zero values in a SparseMatrix.
    
    Parameters:
    f - (undocumented)
    
    Returns:
    (undocumented)
  - foreachActive
```
void foreachActive(scala.Function3<java.lang.Object,java.lang.Object,java.lang.Object,scala.runtime.BoxedUnit> f)
```
    Applies a function f to all the active elements of dense and sparse matrix. The ordering of the elements are not defined.
    
    Parameters:
    f - the function takes three parameters where the first two parameters are the row and column indices respectively with the type Int, and the final parameter is the corresponding value in the matrix with type Double.
  - numNonzeros
```
int numNonzeros()
```
    Find the number of non-zero active values.
    
    Returns:
    (undocumented)
  - numActives
```
int numActives()
```
    Find the number of values stored explicitly. These values can be zero as well.
    
    Returns:
    (undocumented)

Interface Matrix

Method Summary

Method Detail

numRows

numCols

isTransposed

toArray

colIter

rowIter

toBreeze

apply

index

update

copy

transpose

multiply

multiply

multiply

toString

toString

map

update

foreachActive

numNonzeros

numActives