Class DenseMatrix

java.lang.Object
org.la4j.Matrix
org.la4j.matrix.DenseMatrix
All Implemented Interfaces:
Iterable<Double>
Direct Known Subclasses:
Basic1DMatrix, Basic2DMatrix

public abstract class DenseMatrix extends Matrix
  • Constructor Details

    • DenseMatrix

      public DenseMatrix(int rows, int columns)
  • Method Details

    • zero

      public static DenseMatrix zero(int rows, int columns)
      Creates a zero DenseMatrix of the given shape: rows x columns.
    • constant

      public static DenseMatrix constant(int rows, int columns, double constant)
      Creates a constant DenseMatrix of the given shape and value.
    • diagonal

      public static DenseMatrix diagonal(int size, double diagonal)
      Creates a diagonal DenseMatrix of the given size whose diagonal elements are equal to diagonal.
    • unit

      public static DenseMatrix unit(int rows, int columns)
      Creates an unit DenseMatrix of the given shape: rows x columns.
    • identity

      public static DenseMatrix identity(int size)
      Creates an identity DenseMatrix of the given size.
    • random

      public static DenseMatrix random(int rows, int columns, Random random)
      Creates a random DenseMatrix of the given shape: rows x columns.
    • randomSymmetric

      public static DenseMatrix randomSymmetric(int size, Random random)
      Creates a random symmetric DenseMatrix of the given size.
    • from1DArray

      public static DenseMatrix from1DArray(int rows, int columns, double[] array)
      Creates a DenseMatrix of the given 1D array w/o copying the underlying array.
    • from2DArray

      public static DenseMatrix from2DArray(double[][] array)
      Creates a DenseMatrix of the given 2D array w/o copying the underlying array.
    • block

      public static DenseMatrix block(Matrix a, Matrix b, Matrix c, Matrix d)
      Creates a block DenseMatrix of the given blocks a, b, c and d.
    • fromCSV

      public static DenseMatrix fromCSV(String csv)
      Parses DenseMatrix from the given CSV string.
      Parameters:
      csv - the CSV string representing a matrix
      Returns:
      a parsed matrix
    • fromMatrixMarket

      public static DenseMatrix fromMatrixMarket(String mm)
      Parses DenseMatrix from the given Matrix Market string.
      Parameters:
      mm - the string in Matrix Market format
      Returns:
      a parsed matrix
    • toArray

      public abstract double[][] toArray()
      Converts this dense matrix to double array.
      Returns:
      an array representation of this matrix
    • getRow

      public Vector getRow(int i)
      Description copied from class: Matrix
      Copies the specified row of this matrix into the vector.
      Specified by:
      getRow in class Matrix
      Parameters:
      i - the row index
      Returns:
      the row represented as vector
    • getColumn

      public Vector getColumn(int j)
      Description copied from class: Matrix
      Copies the specified column of this matrix into the vector.
      Specified by:
      getColumn in class Matrix
      Parameters:
      j - the column index
      Returns:
      the column represented as vector
    • apply

      public <T> T apply(MatrixOperation<T> operation)
      Description copied from class: Matrix
      Pipes this matrix to a given operation.
      Specified by:
      apply in class Matrix
      Type Parameters:
      T - the result type
      Parameters:
      operation - the matrix operation (an operation that takes a matrix and returns T)
      Returns:
      the result of an operation applied to this matrix
    • apply

      public <T> T apply(MatrixMatrixOperation<T> operation, Matrix that)
      Description copied from class: Matrix
      Pipes this matrix to a given operation.
      Specified by:
      apply in class Matrix
      Type Parameters:
      T - the result type
      Parameters:
      operation - the matrix-matrix operation (an operation that takes two matrices and returns T)
      that - the right hand matrix of the given operation
      Returns:
      the result of an operation applied to this matrix
    • apply

      public <T> T apply(MatrixVectorOperation<T> operation, Vector that)
      Description copied from class: Matrix
      Pipes this matrix to a given operation.
      Specified by:
      apply in class Matrix
      Type Parameters:
      T - the result type
      Parameters:
      operation - the matrix-vector operation (an operation that takes matrix and vector and returns T)
      that - the right hand vector of the given operation
      Returns:
      the result of an operation applied to this matrix
    • toMatrixMarket

      public String toMatrixMarket(NumberFormat formatter)
      Description copied from class: Matrix
      Converts this matrix into the Matrix Market string using the given number formatter.
      Specified by:
      toMatrixMarket in class Matrix
      Returns:
      a string in Matrix Market format representing this matrix;