fr.cnes.sirius.patrius.math.optim.joptimizer.algebra

Interface MatrixRescaler

All Known Implementing Classes:

Matrix1NornRescaler

public interface MatrixRescaler

Interface for Matrix rescalers. Calculate the row and column scaling matrices R and T relative to a given matrix A (scaled A = R.A.T). They may be used, for instance, to scale the matrix prior to solving a corresponding set of linear equations.

Since:

4.6

Author:

alberto trivellato (alberto.trivellato@gmail.com)

Method Summary

Modifier and Type	Method and Description
boolean	checkScaling(RealMatrix aOriginal, RealVector u, RealVector v) Check if the scaling algorithm returned proper results.
RealVector[]	getMatrixScalingFactors(RealMatrix a) Calculates the R and T scaling factors (matrices) for a generic matrix A so that A'(=scaled A) = R.A.T
RealVector	getMatrixScalingFactorsSymm(RealMatrix a) Calculates the R and T scaling factors (matrices) for a symmetric matrix A so that A'(=scaled A) = R.A.T

Method Detail

getMatrixScalingFactors

RealVector[] getMatrixScalingFactors(RealMatrix a)

Calculates the R and T scaling factors (matrices) for a generic matrix A so that A'(=scaled A) = R.A.T

Parameters:

a - matrix A

Returns:

array with R,T

getMatrixScalingFactorsSymm

RealVector getMatrixScalingFactorsSymm(RealMatrix a)

Calculates the R and T scaling factors (matrices) for a symmetric matrix A so that A'(=scaled A) = R.A.T

Parameters:

a - matrix A

Returns:

array with R,T

checkScaling

boolean checkScaling(RealMatrix aOriginal,
                     RealVector u,
                     RealVector v)

Check if the scaling algorithm returned proper results.

Parameters:

aOriginal - the ORIGINAL (before scaling) matrix

u - the return of the scaling algorithm

v - the return of the scaling algorithm

Returns:

true/false