Class LUDecompositionBase_ZDRM

All Implemented Interfaces:
DecompositionInterface<ZMatrixRMaj>, LUDecomposition<ZMatrixRMaj>, LUDecomposition_F64<ZMatrixRMaj>
Direct Known Subclasses:

public abstract class LUDecompositionBase_ZDRM extends Object implements LUDecomposition_F64<ZMatrixRMaj>

Contains common data structures and operations for LU decomposition algorithms.

  • Field Details

    • LU

      protected ZMatrixRMaj LU
    • maxWidth

      protected int maxWidth
    • m

      protected int m
    • n

      protected int n
    • stride

      protected int stride
    • dataLU

      protected double[] dataLU
    • vv

      protected double[] vv
    • indx

      protected int[] indx
    • pivot

      protected int[] pivot
    • pivsign

      protected double pivsign
    • det

      protected Complex_F64 det
  • Constructor Details

    • LUDecompositionBase_ZDRM

      public LUDecompositionBase_ZDRM()
  • Method Details

    • setExpectedMaxSize

      public void setExpectedMaxSize(int numRows, int numCols)
    • getLU

      public ZMatrixRMaj getLU()
    • getIndx

      public int[] getIndx()
    • getPivot

      public int[] getPivot()
    • inputModified

      public boolean inputModified()
      Description copied from interface: DecompositionInterface
      Checks if the input matrix to DecompositionInterface.decompose( is modified during the decomposition process.
      Specified by:
      inputModified in interface DecompositionInterface<ZMatrixRMaj>
      true if the input matrix to decompose() is modified.
    • getLower

      public ZMatrixRMaj getLower(@Nullable @Nullable ZMatrixRMaj lower)
      Writes the lower triangular matrix into the specified matrix.
      Specified by:
      getLower in interface LUDecomposition<ZMatrixRMaj>
      lower - Where the lower triangular matrix is written to.
      The L matrix.
    • getUpper

      public ZMatrixRMaj getUpper(@Nullable @Nullable ZMatrixRMaj upper)
      Writes the upper triangular matrix into the specified matrix.
      Specified by:
      getUpper in interface LUDecomposition<ZMatrixRMaj>
      upper - Where the upper triangular matrix is writen to.
      The U matrix.
    • getRowPivot

      public ZMatrixRMaj getRowPivot(@Nullable @Nullable ZMatrixRMaj pivot)
      Description copied from interface: LUDecomposition

      For numerical stability there are often row interchanges. This computes a pivot matrix that will undo those changes.

      Specified by:
      getRowPivot in interface LUDecomposition<ZMatrixRMaj>
      pivot - Storage for the pivot matrix. If null then a new matrix is returned. Modified.
      The pivot matrix.
    • getRowPivotV

      public int[] getRowPivotV(@Nullable @Nullable IGrowArray pivot)
      Description copied from interface: LUDecomposition
      Returns the row pivot vector
      Specified by:
      getRowPivotV in interface LUDecomposition<ZMatrixRMaj>
      pivot - (Optional) Storage for pivot vector
      The pivot vector
    • decomposeCommonInit

      protected void decomposeCommonInit(ZMatrixRMaj a)
    • isSingular

      public boolean isSingular()
      Determines if the decomposed matrix is singular. This function can return false and the matrix be almost singular, which is still bad.
      Specified by:
      isSingular in interface LUDecomposition<ZMatrixRMaj>
      true if singular false otherwise.
    • computeDeterminant

      public Complex_F64 computeDeterminant()
      Computes the determinant from the LU decomposition.
      Specified by:
      computeDeterminant in interface LUDecomposition_F64<ZMatrixRMaj>
      The matrix's determinant.
    • quality

      public double quality()
    • _solveVectorInternal

      public void _solveVectorInternal(double[] vv)
      a specialized version of solve that avoid additional checks that are not needed.
    • solveL

      protected void solveL(double[] vv)
      Solve the using the lower triangular matrix in LU. Diagonal elements are assumed to be 1
    • _getVV

      public double[] _getVV()