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## weka.core
Class Matrix

    java.lang.Object
      weka.core.Matrix

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:
  ConfusionMatrix, CostMatrix

Deprecated. Use instead `weka.core.matrix.Matrix` - only for backwards compatibility.

    public class Matrix

extends java.lang.Object
implements java.lang.Cloneable, java.io.Serializable

Class for performing operations on a matrix of floating-point values.

Deprecated: Uses internally the code of the sub-package `weka.core.matrix` - only for backwards compatibility.

Version:
  $Revision: 1.18.2.2 $
Author:
  Gabi Schmidberger (gabi@cs.waikato.ac.nz), Yong Wang (yongwang@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz), Len Trigg (eibe@cs.waikato.ac.nz), Fracpete (fracpete at waikato dot ac dot nz)
See Also:
  Serialized Form

Constructor Summary
`Matrix(double[][] array)` Deprecated. Constructs a matrix using a given array.
`Matrix(int nr, int nc)` Deprecated. Constructs a matrix and initializes it with default values.
`Matrix(java.io.Reader r)` Deprecated. Reads a matrix from a reader.

Method Summary
`Matrix` | `add(Matrix other)` Deprecated. Returns the sum of this matrix with another.
`void` | `addElement(int rowIndex, int columnIndex, double value)` Deprecated. Add a value to an element.
`java.lang.Object` | `clone()` Deprecated. Creates and returns a clone of this object.
`void` | `eigenvalueDecomposition(double[][] V, double[] d)` Deprecated. Performs Eigenvalue Decomposition using Householder QR Factorization Matrix must be symmetrical.
`double[]` | `getColumn(int index)` Deprecated. Gets a column of the matrix and returns it as a double array.
`double` | `getElement(int rowIndex, int columnIndex)` Deprecated. Returns the value of a cell in the matrix.
`Matrix` | `getL()` Deprecated. Returns the L part of the matrix.
`double[]` | `getRow(int index)` Deprecated. Gets a row of the matrix and returns it as double array.
`Matrix` | `getU()` Deprecated. Returns the U part of the matrix.
`boolean` | `isSymmetric()` Deprecated. Returns true if the matrix is symmetric.
`int[]` | `LUDecomposition()` Deprecated. Performs a LUDecomposition on the matrix.
`static void` | `main(java.lang.String[] ops)` Deprecated. Main method for testing this class.
`Matrix` | `multiply(Matrix b)` Deprecated. Returns the multiplication of two matrices
`int` | `numColumns()` Deprecated. Returns the number of columns in the matrix.
`int` | `numRows()` Deprecated. Returns the number of rows in the matrix.
`static Matrix` | `parseMatlab(java.lang.String matlab)` Deprecated. creates a matrix from the given Matlab string.
`double[]` | `regression(Matrix y, double ridge)` Deprecated. Performs a (ridged) linear regression.
`double[]` | `regression(Matrix y, double[] w, double ridge)` Deprecated. Performs a weighted (ridged) linear regression.
`void` | `setColumn(int index, double[] newColumn)` Deprecated. Sets a column of the matrix to the given column.
`void` | `setElement(int rowIndex, int columnIndex, double value)` Deprecated. Sets an element of the matrix to the given value.
`void` | `setRow(int index, double[] newRow)` Deprecated. Sets a row of the matrix to the given row.
`void` | `solve(double[] bb)` Deprecated. Solve A*X = B using backward substitution.
`java.lang.String` | `toMatlab()` Deprecated. converts the Matrix into a single line Matlab string: matrix is enclosed by parentheses, rows are separated by semicolon and single cells by blanks, e.g., [1 2; 3 4].
`java.lang.String` | `toString()` Deprecated. Converts a matrix to a string
`Matrix` | `transpose()` Deprecated. Returns the transpose of a matrix.
`void` | `write(java.io.Writer w)` Deprecated. Writes out a matrix.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Matrix

    public Matrix(int nr,
                  int nc)

  Deprecated.
  Constructs a matrix and initializes it with default values.

  Parameters:
    `nr` - the number of rows
    `nc` - the number of columns

### Matrix

    public Matrix(double[][] array)
           throws java.lang.Exception

  Deprecated.
  Constructs a matrix using a given array.

  Parameters:
    `array` - the values of the matrix
  Throws:
    `java.lang.Exception`

### Matrix

    public Matrix(java.io.Reader r)
           throws java.lang.Exception

  Deprecated.
  Reads a matrix from a reader. The first line in the file should contain the number of rows and columns. Subsequent lines contain elements of the matrix.

  Parameters:
    `r` - the reader containing the matrix
  Throws:
    `java.lang.Exception` - if an error occurs

Method Detail

### clone

    public java.lang.Object clone()

  Deprecated.
  Creates and returns a clone of this object.

  Overrides:
    `clone` in class `java.lang.Object`
  Returns:
    a clone of this instance.
  Throws:
    `java.lang.Exception` - if an error occurs

### write

    public void write(java.io.Writer w)
               throws java.lang.Exception

  Deprecated.
  Writes out a matrix.

  Parameters:
    `w` - the output Writer
  Throws:
    `java.lang.Exception` - if an error occurs

### getElement

    public final double getElement(int rowIndex,
                                   int columnIndex)

  Deprecated.
  Returns the value of a cell in the matrix.

  Parameters:
    `rowIndex` - the row's index
    `columnIndex` - the column's index
  Returns:
    the value of the cell of the matrix

### addElement

    public final void addElement(int rowIndex,
                                 int columnIndex,
                                 double value)

  Deprecated.
  Add a value to an element.

  Parameters:
    `rowIndex` - the row's index.
    `columnIndex` - the column's index.
    `value` - the value to add.

### numRows

    public final int numRows()

  Deprecated.
  Returns the number of rows in the matrix.

  Returns:
    the number of rows

### numColumns

    public final int numColumns()

  Deprecated.
  Returns the number of columns in the matrix.

  Returns:
    the number of columns

### setElement

    public final void setElement(int rowIndex,
                                 int columnIndex,
                                 double value)

  Deprecated.
  Sets an element of the matrix to the given value.

  Parameters:
    `rowIndex` - the row's index
    `columnIndex` - the column's index
    `value` - the value

### setRow

    public final void setRow(int index,
                             double[] newRow)

  Deprecated.
  Sets a row of the matrix to the given row. Performs a deep copy.

  Parameters:
    `index` - the row's index
    `newRow` - an array of doubles

### getRow

    public double[] getRow(int index)

  Deprecated.
  Gets a row of the matrix and returns it as double array.

  Parameters:
    `index` - the row's index
  Returns:
    an array of doubles

### getColumn

    public double[] getColumn(int index)

  Deprecated.
  Gets a column of the matrix and returns it as a double array.

  Parameters:
    `index` - the column's index
  Returns:
    an array of doubles

### setColumn

    public final void setColumn(int index,
                                double[] newColumn)

  Deprecated.
  Sets a column of the matrix to the given column. Performs a deep copy.

  Parameters:
    `index` - the column's index
    `newColumn` - an array of doubles

### toString

    public java.lang.String toString()

  Deprecated.
  Converts a matrix to a string

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    the converted string

### add

    public final Matrix add(Matrix other)

  Deprecated.
  Returns the sum of this matrix with another.

  Returns:
    a matrix containing the sum.

### transpose

    public final Matrix transpose()

  Deprecated.
  Returns the transpose of a matrix.

  Returns:
    the transposition of this instance.

### isSymmetric

    public boolean isSymmetric()

  Deprecated.
  Returns true if the matrix is symmetric.

  Returns:
    boolean true if matrix is symmetric.

### multiply

    public final Matrix multiply(Matrix b)

  Deprecated.
  Returns the multiplication of two matrices

  Parameters:
    `b` - the multiplication matrix
  Returns:
    the product matrix

### regression

    public final double[] regression(Matrix y,
                                     double ridge)

  Deprecated.
  Performs a (ridged) linear regression.

  Parameters:
    `y` - the dependent variable vector
    `ridge` - the ridge parameter
  Returns:
    the coefficients
  Throws:
    `java.lang.IllegalArgumentException` - if not successful

### regression

    public final double[] regression(Matrix y,
                                     double[] w,
                                     double ridge)

  Deprecated.
  Performs a weighted (ridged) linear regression.

  Parameters:
    `y` - the dependent variable vector
    `w` - the array of data point weights
    `ridge` - the ridge parameter
  Returns:
    the coefficients
  Throws:
    `java.lang.IllegalArgumentException` - if the wrong number of weights were provided.

### getL

    public Matrix getL()
                throws java.lang.Exception

  Deprecated.
  Returns the L part of the matrix. This does only make sense after LU decomposition.

  Returns:
    matrix with the L part of the matrix;
  Throws:
    `java.lang.Exception`
  See Also:
    `LUDecomposition()`

### getU

    public Matrix getU()
                throws java.lang.Exception

  Deprecated.
  Returns the U part of the matrix. This does only make sense after LU decomposition.

  Returns:
    matrix with the U part of a matrix;
  Throws:
    `java.lang.Exception`
  See Also:
    `LUDecomposition()`

### LUDecomposition

    public int[] LUDecomposition()
                          throws java.lang.Exception

  Deprecated.
  Performs a LUDecomposition on the matrix. It changes the matrix into its LU decomposition.

  Returns:
    the indices of the row permutation
  Throws:
    `java.lang.Exception`

### solve

    public void solve(double[] bb)
               throws java.lang.Exception

  Deprecated.
  Solve A*X = B using backward substitution. A is current object (this). Note that this matrix will be changed! B parameter bb. X returned in parameter bb.

  Parameters:
    `bb` - first vector B in above equation then X in same equation.
  Throws:
    `java.lang.Exception`

### eigenvalueDecomposition

    public void eigenvalueDecomposition(double[][] V,
                                        double[] d)
                                 throws java.lang.Exception

  Deprecated.
  Performs Eigenvalue Decomposition using Householder QR Factorization Matrix must be symmetrical. Eigenvectors are return in parameter V, as columns of the 2D array. (Real parts of) Eigenvalues are returned in parameter d.

  Parameters:
    `V` - double array in which the eigenvectors are returned
    `d` - array in which the eigenvalues are returned
  Throws:
    `java.lang.Exception` - if matrix is not symmetric

### toMatlab

    public java.lang.String toMatlab()

  Deprecated.
  converts the Matrix into a single line Matlab string: matrix is enclosed by parentheses, rows are separated by semicolon and single cells by blanks, e.g., [1 2; 3 4].

  Returns:
    the matrix in Matlab single line format

### parseMatlab

    public static Matrix parseMatlab(java.lang.String matlab)
                              throws java.lang.Exception

  Deprecated.
  creates a matrix from the given Matlab string.

  Parameters:
    `matlab` - the matrix in matlab format
  Returns:
    the matrix represented by the given string
  Throws:
    `java.lang.Exception`
  See Also:
    `toMatlab()`

### main

    public static void main(java.lang.String[] ops)

  Deprecated.
  Main method for testing this class.

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