cern.colt.matrix.tdouble.algo.solver

Class DoubleGivensRotation

java.lang.Object

cern.colt.matrix.tdouble.algo.solver.DoubleGivensRotation

public class DoubleGivensRotation
extends java.lang.Object

Givens plane rotation

Constructor Summary

Constructors

Constructor and Description
DoubleGivensRotation(double x, double y) Constructs a Givens plane rotation for a given 2-vector

Method Summary

Modifier and Type	Method and Description
void	apply(DoubleMatrix1D x, int i1, int i2) Applies the Givens rotation to two elements of a vector
void	apply(DoubleMatrix2D H, int column, int i1, int i2) Applies the Givens rotation to two elements in a matrix column

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DoubleGivensRotation

public DoubleGivensRotation(double x,
                            double y)

Constructs a Givens plane rotation for a given 2-vector

Parameters:

x - First component of the vector

y - Second component of the vector

Method Detail

apply

public void apply(DoubleMatrix2D H,
                  int column,
                  int i1,
                  int i2)

Applies the Givens rotation to two elements in a matrix column

Parameters:

H - Matrix to apply to

column - Column index

i1 - Row index of first element

i2 - Row index of second element

apply

public void apply(DoubleMatrix1D x,
                  int i1,
                  int i2)

Applies the Givens rotation to two elements of a vector

Parameters:

x - Vector to apply to

i1 - Index of first element

i2 - Index of second element