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## org.encog.mathutil.matrices
Class Matrix

    java.lang.Object
      org.encog.mathutil.matrices.Matrix

All Implemented Interfaces:
  Serializable, Cloneable

    public class Matrix

extends Object
implements Cloneable, Serializable

This class implements a mathematical matrix. Matrix math is very important to neural network processing. Many of the neural network classes make use of the matrix classes in this package.

See Also:
  Serialized Form

Constructor Summary
`Matrix(boolean[][] sourceMatrix)` Construct a bipolar matrix from an array of booleans.
`Matrix(double[][] sourceMatrix)` Create a matrix from an array of doubles.
`Matrix(int rows, int cols)` Create a blank array with the specified number of rows and columns.

Method Summary
`void` | `add(int row, int col, double value)` Add a value to one cell in the matrix.
`void` | `add(Matrix theMatrix)` Add the specified matrix to this matrix.
`void` | `clear()` Set all rows and columns to zero.
`Matrix` | `clone()` Create a copy of the matrix.
`static Matrix` | `createColumnMatrix(double[] input)` Turn an array of doubles into a column matrix.
`static Matrix` | `createRowMatrix(double[] input)` Turn an array of doubles into a row matrix.
`boolean` | `equals(Matrix theMatrix, int precision)` Compare to matrixes with the specified level of precision.
`boolean` | `equals(Object other)` Check to see if this matrix equals another, using default precision.
`int` | `fromPackedArray(double[] array, int index)` Create a matrix from a packed array.
`double` | `get(int row, int col)` Read the specified cell in the matrix.
`double[][]` | `getArrayCopy()`
`Matrix` | `getCol(int col)` Read one entire column from the matrix as a sub-matrix.
`int` | `getCols()` Get the columns in the matrix.
`double[][]` | `getData()`
`Matrix` | `getMatrix(int[] r, int[] c)` Get a submatrix.
`Matrix` | `getMatrix(int[] r, int j0, int j1)` Get a submatrix.
`Matrix` | `getMatrix(int i0, int i1, int[] c)` Get a submatrix.
`Matrix` | `getMatrix(int i0, int i1, int j0, int j1)` Get a submatrix.
`Matrix` | `getRow(int row)` Get the specified row as a sub-matrix.
`int` | `getRows()` Get the number of rows in the matrix.
`int` | `hashCode()` Compute a hash code for this matrix.
`Matrix` | `inverse()`
`boolean` | `isSquare()`
`boolean` | `isVector()` Determine if the matrix is a vector.
`boolean` | `isZero()` Return true if every value in the matrix is zero.
`void` | `multiply(double value)` Multiply every value in the matrix by the specified value.
`void` | `multiply(double[] vector, double[] result)` Multiply every row by the specified vector.
`void` | `randomize(double min, double max)` Randomize the matrix.
`void` | `set(double value)` Set every value in the matrix to the specified value.
`void` | `set(int row, int col, double value)` Set an individual cell in the matrix to the specified value.
`void` | `set(Matrix theMatrix)` Set this matrix's values to that of another matrix.
`void` | `setMatrix(int[] r, int[] c, Matrix x)` Set a submatrix.
`void` | `setMatrix(int[] r, int j0, int j1, Matrix x)` Set a submatrix.
`void` | `setMatrix(int i0, int i1, int[] c, Matrix x)` Set a submatrix.
`void` | `setMatrix(int i0, int i1, int j0, int j1, Matrix x)` Set a submatrix.
`int` | `size()` Get the size of the array.
`Matrix` | `solve(Matrix b)` Solve A*X = B.
`double` | `sum()` Sum all of the values in the matrix.
`double[]` | `toPackedArray()` Convert the matrix into a packed array.
`String` | `toString()`

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

Constructor Detail

### Matrix

    public Matrix(boolean[][] sourceMatrix)

  Construct a bipolar matrix from an array of booleans.

  Parameters:
    `sourceMatrix` - The booleans to create the matrix from.

### Matrix

    public Matrix(double[][] sourceMatrix)

  Create a matrix from an array of doubles.

  Parameters:
    `sourceMatrix` - An array of doubles.

### Matrix

    public Matrix(int rows,
                  int cols)

  Create a blank array with the specified number of rows and columns.

  Parameters:
    `rows` - How many rows in the matrix.
    `cols` - How many columns in the matrix.

Method Detail

### createColumnMatrix

    public static Matrix createColumnMatrix(double[] input)

  Turn an array of doubles into a column matrix.

  Parameters:
    `input` - A double array.
  Returns:
    A column matrix.

### createRowMatrix

    public static Matrix createRowMatrix(double[] input)

  Turn an array of doubles into a row matrix.

  Parameters:
    `input` - A double array.
  Returns:
    A row matrix.

### add

    public void add(int row,
                    int col,
                    double value)

  Add a value to one cell in the matrix.

  Parameters:
    `row` - The row to add to.
    `col` - The column to add to.
    `value` - The value to add to the matrix.

### add

    public void add(Matrix theMatrix)

  Add the specified matrix to this matrix. This will modify the matrix to hold the result of the addition.

  Parameters:
    `theMatrix` - The matrix to add.

### clear

    public void clear()

  Set all rows and columns to zero.

### clone

    public Matrix clone()

  Create a copy of the matrix.

  Overrides:
    `clone` in class `Object`
  Returns:
    A colne of the matrix.

### equals

    public boolean equals(Matrix theMatrix,
                          int precision)

  Compare to matrixes with the specified level of precision.

  Parameters:
    `theMatrix` - The other matrix to compare to.
    `precision` - How much precision to use.
  Returns:
    True if the two matrixes are equal.

### equals

    public boolean equals(Object other)

  Check to see if this matrix equals another, using default precision.

  Overrides:
    `equals` in class `Object`
  Parameters:
    `other` - The other matrix to compare.
  Returns:
    True if the two matrixes are equal.

### fromPackedArray

    public int fromPackedArray(double[] array,
                               int index)

  Create a matrix from a packed array.

  Parameters:
    `array` - The packed array.
    `index` - Where to start in the packed array.
  Returns:
    The new index after this matrix has been read.

### get

    public double get(int row,
                      int col)

  Read the specified cell in the matrix.

  Parameters:
    `row` - The row to read.
    `col` - The column to read.
  Returns:
    The value at the specified row and column.

### getArrayCopy

    public double[][] getArrayCopy()

  Returns:
    A COPY of this matrix as a 2d array.

### getCol

    public Matrix getCol(int col)

  Read one entire column from the matrix as a sub-matrix.

  Parameters:
    `col` - The column to read.
  Returns:
    The column as a sub-matrix.

### getCols

    public int getCols()

  Get the columns in the matrix.

  Returns:
    The number of columns in the matrix.

### getData

    public double[][] getData()

  Returns:
    Get the 2D matrix array.

### getMatrix

    public Matrix getMatrix(int i0,
                            int i1,
                            int j0,
                            int j1)

  Get a submatrix.

  Parameters:
    `i0` - Initial row index.
    `i1` - Final row index.
    `j0` - Initial column index.
    `j1` - Final column index.
  Returns:
    The specified submatrix.

### getMatrix

    public Matrix getMatrix(int i0,
                            int i1,
                            int[] c)

  Get a submatrix.

  Parameters:
    `i0` - Initial row index.
    `i1` - Final row index.
    `c` - Array of column indices.
  Returns:
    The specified submatrix.

### getMatrix

    public Matrix getMatrix(int[] r,
                            int j0,
                            int j1)

  Get a submatrix.

  Parameters:
    `r` - Array of row indices.
    `j0` - Initial column index
    `j1` - Final column index
  Returns:
    The specified submatrix.

### getMatrix

    public Matrix getMatrix(int[] r,
                            int[] c)

  Get a submatrix.

  Parameters:
    `r` - Array of row indices.
    `c` - Array of column indices.
  Returns:
    The specified submatrix.

### getRow

    public Matrix getRow(int row)

  Get the specified row as a sub-matrix.

  Parameters:
    `row` - The row to get.
  Returns:
    A matrix.

### getRows

    public int getRows()

  Get the number of rows in the matrix.

  Returns:
    The number of rows in the matrix.

### hashCode

    public int hashCode()

  Compute a hash code for this matrix.

  Overrides:
    `hashCode` in class `Object`
  Returns:
    The hash code.

### inverse

    public Matrix inverse()

  Returns:
    The matrix inverted.

### isVector

    public boolean isVector()

  Determine if the matrix is a vector. A vector is has either a single number of rows or columns.

  Returns:
    True if this matrix is a vector.

### isZero

    public boolean isZero()

  Return true if every value in the matrix is zero.

  Returns:
    True if the matrix is all zeros.

### multiply

    public void multiply(double value)

  Multiply every value in the matrix by the specified value.

  Parameters:
    `value` - The value to multiply the matrix by.

### multiply

    public void multiply(double[] vector,
                         double[] result)

  Multiply every row by the specified vector.

  Parameters:
    `vector` - The vector to multiply by.
    `result` - The result to hold the values.

### randomize

    public void randomize(double min,
                          double max)

  Randomize the matrix.

  Parameters:
    `min` - Minimum random value.
    `max` - Maximum random value.

### set

    public void set(double value)

  Set every value in the matrix to the specified value.

  Parameters:
    `value` - The value to set the matrix to.

### set

    public void set(int row,
                    int col,
                    double value)

  Set an individual cell in the matrix to the specified value.

  Parameters:
    `row` - The row to set.
    `col` - The column to set.
    `value` - The value to be set.

### set

    public void set(Matrix theMatrix)

  Set this matrix's values to that of another matrix.

  Parameters:
    `theMatrix` - The other matrix.

### setMatrix

    public void setMatrix(int i0,
                          int i1,
                          int j0,
                          int j1,
                          Matrix x)

  Set a submatrix.

  Parameters:
    `i0` - Initial row index
    `i1` - Final row index
    `j0` - Initial column index
    `j1` - Final column index
    `x` - A(i0:i1,j0:j1)

### setMatrix

    public void setMatrix(int i0,
                          int i1,
                          int[] c,
                          Matrix x)

  Set a submatrix.

  Parameters:
    `i0` - Initial row index
    `i1` - Final row index
    `c` - Array of column indices.
    `x` - The submatrix.

### setMatrix

    public void setMatrix(int[] r,
                          int j0,
                          int j1,
                          Matrix x)

  Set a submatrix.

  Parameters:
    `r` - Array of row indices.
    `j0` - Initial column index
    `j1` - Final column index
    `x` - A(r(:),j0:j1)

### setMatrix

    public void setMatrix(int[] r,
                          int[] c,
                          Matrix x)

  Set a submatrix.

  Parameters:
    `r` - Array of row indices.
    `c` - Array of column indices.
    `x` - The matrix to set.

### size

    public int size()

  Get the size of the array. This is the number of elements it would take to store the matrix as a packed array.

  Returns:
    The size of the matrix.

### solve

    public Matrix solve(Matrix b)

  Solve A*X = B.

  Parameters:
    `b` - right hand side.
  Returns:
    Solution if A is square, least squares solution otherwise.

### sum

    public double sum()

  Sum all of the values in the matrix.

  Returns:
    The sum of the matrix.

### toPackedArray

    public double[] toPackedArray()

  Convert the matrix into a packed array.

  Returns:
    The matrix as a packed array.

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### isSquare

    public boolean isSquare()

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