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  •  JAMA Pythagorean Theorem: a = 3 b = 4 r = sqrt(square(a) + square(b)) r = 5 r = sqrt(a^2 + b^2) without under/overflow
  •  PHPExcel
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     Methods

    Polymorphic constructor

    __construct() 

    As PHP has no support for polymorphic constructors, we hack our own sort of polymorphism using func_num_args, func_get_arg, and gettype. In essence, we're just implementing a simple RTTI filter and calling the appropriate constructor.

    arrayLeftDivide

    arrayLeftDivide() : \Matrix

    Element-by-element Left division A / B

    Returns

    \MatrixDivision result

    arrayLeftDivideEquals

    arrayLeftDivideEquals() : \Matrix

    Element-by-element Left division Aij = Aij / Bij

    Returns

    \MatrixMatrix Aij

    arrayRightDivide

    arrayRightDivide() : \Matrix

    Element-by-element right division A / B

    Returns

    \MatrixDivision result

    arrayRightDivideEquals

    arrayRightDivideEquals() : \Matrix

    Element-by-element right division Aij = Aij / Bij

    Returns

    \MatrixMatrix Aij

    arrayTimes

    arrayTimes() : \Matrix

    Element-by-element multiplication Cij = Aij * Bij

    Returns

    \MatrixMatrix Cij

    arrayTimesEquals

    arrayTimesEquals() : \Matrix

    Element-by-element multiplication Aij = Aij * Bij

    Returns

    \MatrixMatrix Aij

    checkMatrixDimensions

    checkMatrixDimensions(\Matrix $B) : boolean

    Is matrix B the same size?

    Parameters

    $B

    \Matrix

    Matrix B

    Returns

    boolean

    concat

    concat() : \Matrix

    A = A & B

    Returns

    \MatrixSum

    det

    det() : float

    Calculate determinant

    Returns

    floatDeterminant

    diagonal

    diagonal(int $m, int $n, mixed $c) : \Matrix

    Generate a diagonal matrix

    Parameters

    $m

    int

    Row dimension

    $n

    int

    Column dimension

    $c

    mixed

    Diagonal value

    Returns

    \MatrixDiagonal matrix

    get

    get(int $i, int $j) : mixed

    Get the i,j-th element of the matrix.

    Parameters

    $i

    int

    Row position

    $j

    int

    Column position

    Returns

    mixedElement (int/float/double)

    getArray

    getArray() : array

    Returns

    arrayMatrix array

    getColumnDimension

    getColumnDimension() : int

    Returns

    intColumn dimension

    getMatrix

    getMatrix() : \Matrix

    Get a submatrix

    Returns

    \MatrixSubmatrix

    getMatrixByCol

    getMatrixByCol($j0, $jF) : \Matrix

    Get a submatrix by column index/range

    Parameters

    $j0

    $jF

    Returns

    \MatrixSubmatrix

    getMatrixByRow

    getMatrixByRow(int $i0, int $iF) : \Matrix

    Get a submatrix by row index/range

    Parameters

    $i0

    int

    Initial row index

    $iF

    int

    Final row index

    Returns

    \MatrixSubmatrix

    getRowDimension

    getRowDimension() : int

    Returns

    intRow dimension

    identity

    identity(int $m, int $n) : \Matrix

    Generate an identity matrix.

    Parameters

    $m

    int

    Row dimension

    $n

    int

    Column dimension

    Returns

    \MatrixIdentity matrix

    Matrix inverse or pseudoinverse.

    inverse() : \Matrix

    Returns

    \Matrix... Inverse(A) if A is square, pseudoinverse otherwise.

    minus

    minus() : \Matrix

    A - B

    Returns

    \MatrixSum

    minusEquals

    minusEquals() : \Matrix

    A = A - B

    Returns

    \MatrixSum

    plus

    plus() : \Matrix

    A + B

    Returns

    \MatrixSum

    plusEquals

    plusEquals() : \Matrix

    A = A + B

    Returns

    \MatrixSum

    power

    power() : \Matrix

    A = A ^ B

    Returns

    \MatrixSum

    set

    set(int $i, int $j, mixed $c) : mixed

    Set the i,j-th element of the matrix.

    Parameters

    $i

    int

    Row position

    $j

    int

    Column position

    $c

    mixed

    Int/float/double value

    Returns

    mixedElement (int/float/double)

    Solve A*X = B.

    solve(\Matrix $B) : \Matrix

    Parameters

    $B

    \Matrix

    Right hand side

    Returns

    \Matrix... Solution if A is square, least squares solution otherwise

    times

    times() : \Matrix

    Matrix multiplication

    Returns

    \MatrixProduct

    trace

    trace() : float

    Sum of diagonal elements

    Returns

    floatSum of diagonal elements

    transpose

    transpose() : \Matrix

    Tranpose matrix

    Returns

    \MatrixTransposed matrix

    uminus

    uminus() : \Matrix

    Unary minus matrix -A

    Returns

    \MatrixUnary minus matrix

     Properties

     

    $A : array
    access public
     

    $m : int
    access private
     

    $n : int
    access private

     Constants

     

    ArgumentBoundsException

    ArgumentBoundsException 
     

    ArgumentTypeException

    ArgumentTypeException 
     

    ArrayLengthException

    ArrayLengthException 
     

    MatrixDimensionException

    MatrixDimensionException 
     

    PolymorphicArgumentException

    PolymorphicArgumentException