Matrix3 - A 3x3 matrix
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.. rubric:: Constructor
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.. class:: Matrix3()

    A 3x3 matrix

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.. rubric:: Attributes
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.. attribute:: Matrix3.m

    Array with matrix values

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.. rubric:: Methods
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.. function:: Matrix3.transpose()

    Transposes this matrix in place

    :returns: This matrix
    :rtype: :class:`Matrix3`

.. function:: Matrix3.transposeIntoArray( r )

    Transposes this matrix into supplied array ``r``

    This matrix is unmodified

    :returns: This matrix
    :rtype: :class:`Matrix3`