MatrixH(float[] elements) throws IndexOutOfRangeException when float[9]

[MathiasGlana]

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Issue description

public MatrixH(float[] elements) throws a IndexOutOfRangeException when elements is 9 elements long.
Sample code

MatrixH(new float[9] {1, 0, 0, 0, 1, 0, 0, 0, 1}); // gives IndexOutOfRangeException 

else if (elements.Length == 9)
{
    this.elements = new float[8];
    for (int i = 0; i < elements.Length; i++)
    this.elements[i] = (float)(elements[i] / elements[8]);
}

should be

else if (elements.Length == 9)
{
    this.elements = new float[8];
    for (int i = 0; i < this.elements.Length; i++)
    this.elements[i] = (float)(elements[i] / elements[8]);
}