QRPDecomposition (ejml-core 0.39 API)

All Superinterfaces:

DecompositionInterface<T>, QRDecomposition<T>

All Known Subinterfaces:

QRPDecomposition_F32<T>, QRPDecomposition_F64<T>
```
public interface QRPDecomposition<T extends Matrix>
extends QRDecomposition<T>
```
Similar to QRDecomposition but it can handle the rank deficient case by performing column pivots during the decomposition. The final decomposition has the following structure:
A*P=Q*R
where A is the original matrix, P is a pivot matrix, Q is an orthogonal matrix, and R is upper triangular.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`T`	`getColPivotMatrix(T P)`	Creates the column pivot matrix.
`int[]`	`getColPivots()`	Ordering of each column after pivoting.
`int`	`getRank()`	Returns the rank as determined by the algorithm.

Methods inherited from interface org.ejml.interfaces.decomposition.DecompositionInterface
decompose, inputModified

Methods inherited from interface org.ejml.interfaces.decomposition.QRDecomposition
getQ, getR

- Method Detail
  - getRank
```
int getRank()
```
    Returns the rank as determined by the algorithm. This is dependent upon a fixed threshold and might not be appropriate for some applications.
    
    Returns:
    
    Matrix's rank
  - getColPivots
```
int[] getColPivots()
```
    Ordering of each column after pivoting. The current column i was original at column pivot[i].
    
    Returns:
    
    Order of columns.
  - getColPivotMatrix
```
T getColPivotMatrix(T P)
```
    Creates the column pivot matrix.
    
    Parameters:
    
    P - Optional storage for pivot matrix. If null a new matrix will be created.
    
    Returns:
    
    The pivot matrix.