Package org.ejml.dense.block

Class VectorOps_DDRB

java.lang.Object
org.ejml.dense.block.VectorOps_DDRB
public class VectorOps_DDRB extends Object

Math operations for inner vectors (row and column) inside of block matrices:

scale: bi = α*ai
div: i = ai/α
add: ci = α*ai + βBi
dot: c = sum ai*bi

All submatrices must be block aligned. All offsets and end indexes are relative to the beginning of each submatrix.

  • Constructor Summary

    Constructors
    Constructor
    Description
    VectorOps_DDRB()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    add_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, double beta, DSubmatrixD1 C, int rowC, int offset, int end)
    Row vector add:
    add: ci = α*ai + βBi
    where 'a', 'b', and 'c' are row vectors within the row block vectors of A, B, and C respectively.
    static void
    div_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, int offset, int end)
    Row vector divide:
    div: bi = ai/α
    where 'a' and 'b' are row vectors within the row block vector A and B.
    static double
    dot_row(int blockLength, DSubmatrixD1 A, int rowA, DSubmatrixD1 B, int rowB, int offset, int end)
    Row vector dot/inner product:
    dot: c = sum ai*bi
    where 'a' and 'b' are row vectors within the row block vector A and B, and 'c' is a scalar.
    static double
    dot_row_col(int blockLength, DSubmatrixD1 A, int rowA, DSubmatrixD1 B, int colB, int offset, int end)
    vector dot/inner product from one row vector and one column vector:
    dot: c = sum ai*bi
    where 'a' is a row vector 'b' is a column vectors within the row block vector A and B, and 'c' is a scalar.
    static void
    scale_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, int offset, int end)
    Row vector scale:
    scale: bi = α*ai
    where 'a' and 'b' are row vectors within the row block vector A and B.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • VectorOps_DDRB

      public VectorOps_DDRB()

  • Method Details

    • scale_row

      public static void scale_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, int offset, int end)

      Row vector scale:
      scale: bi = α*ai
      where 'a' and 'b' are row vectors within the row block vector A and B.

      Parameters:
      A - submatrix. Not modified.
      rowA - which row in A the vector is contained in.
      alpha - scale factor.
      B - submatrix that the results are written to. Modified.
      offset - Index at which the vectors start at.
      end - Index at which the vectors end at.

    • div_row

      public static void div_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, int offset, int end)

      Row vector divide:
      div: bi = ai/α
      where 'a' and 'b' are row vectors within the row block vector A and B.

      Parameters:
      A - submatrix. Not modified.
      rowA - which row in A the vector is contained in.
      alpha - scale factor.
      B - submatrix that the results are written to. Modified.
      offset - Index at which the vectors start at.
      end - Index at which the vectors end at.

    • add_row

      public static void add_row(int blockLength, DSubmatrixD1 A, int rowA, double alpha, DSubmatrixD1 B, int rowB, double beta, DSubmatrixD1 C, int rowC, int offset, int end)

      Row vector add:
      add: ci = α*ai + βBi
      where 'a', 'b', and 'c' are row vectors within the row block vectors of A, B, and C respectively.

      Parameters:
      blockLength - Length of each inner matrix block.
      A - submatrix. Not modified.
      rowA - which row in A the vector is contained in.
      alpha - scale factor of A
      B - submatrix. Not modified.
      rowB - which row in B the vector is contained in.
      beta - scale factor of B
      C - submatrix where the results are written to. Modified.
      rowC - which row in C is the vector contained.
      offset - Index at which the vectors start at.
      end - Index at which the vectors end at.

    • dot_row

      public static double dot_row(int blockLength, DSubmatrixD1 A, int rowA, DSubmatrixD1 B, int rowB, int offset, int end)

      Row vector dot/inner product:
      dot: c = sum ai*bi
      where 'a' and 'b' are row vectors within the row block vector A and B, and 'c' is a scalar.

      Parameters:
      A - submatrix. Not modified.
      rowA - which row in A the vector is contained in.
      B - submatrix. Not modified.
      rowB - which row in B the vector is contained in.
      offset - Index at which the vectors start at.
      end - Index at which the vectors end at.
      Returns:
      Results of the dot product.

    • dot_row_col

      public static double dot_row_col(int blockLength, DSubmatrixD1 A, int rowA, DSubmatrixD1 B, int colB, int offset, int end)

      vector dot/inner product from one row vector and one column vector:
      dot: c = sum ai*bi
      where 'a' is a row vector 'b' is a column vectors within the row block vector A and B, and 'c' is a scalar.

      Parameters:
      A - block row vector. Not modified.
      rowA - which row in A the vector is contained in.
      B - block column vector. Not modified.
      colB - which column in B is the vector contained in.
      offset - Index at which the vectors start at.
      end - Index at which the vectors end at.
      Returns:
      Results of the dot product.