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java.lang.Objectno.uib.cipr.matrix.QRP
public class QRP
Computes QR decompositions with column pivoting:
A*P = Q*R
where
A(m,n)
, Q(m,m)
, and R(m,n)
, more generally:
A*P = [Q1 Q2] * [R11, R12; 0 R22]
and R22
elements are
negligible.
Constructor Summary | |
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QRP(int m,
int n)
Constructs an empty QR decomposition |
Method Summary | |
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QRP |
factor(Matrix A)
Executes a QR factorization for the given matrix. |
static QRP |
factorize(Matrix A)
Convenience method to compute a QR decomposition |
Matrix |
getP()
Returns the column pivoting matrix. |
int[] |
getPVector()
Returns the column pivoting vector. |
DenseMatrix |
getQ()
Returns the orthogonal matrix |
DenseMatrix |
getR()
Returns the upper triangular factor |
int |
getRank()
Returns the rank of the factored matrix |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public QRP(int m, int n)
m
- the number of rows.n
- the number of columns.Method Detail |
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public static QRP factorize(Matrix A)
A
- the matrix to decompose (not modified)
public QRP factor(Matrix A)
A
- the matrix to be factored (not modified)
public DenseMatrix getR()
public DenseMatrix getQ()
public int[] getPVector()
getP()
.
public Matrix getP()
getPVector()
.
public int getRank()
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