====== 2x2 Matrix ======

A 2x2 matrix can be constructed as an identity matrix or you can specify the values you'd like entered as floats.

The values of the matrix are stored in such a way that you can access them both by the ''[]'' operator, and as member variables.

As an array:
<code c>
float ImpulsePhysics::Matrix2x2::Determinant() const {
	return asArray[0] * asArray[3] - asArray[1] * asArray[2];
}
</code>

As variables:
<code c>
float ImpulsePhysics::Matrix2x2::Determinant() const {
	return _11 * _22 - _12 * _21;
}
</code>


2x2 matrices offer the following functions within their class:
  * ''Transpose''
  * ''Determinant''
  * ''Inverse''
  * ''Adjugate'' (aka adjoint)

Note that none of these functions will modify the current matrix object, rather they return a new 2x2 matrix with the operation applied. 


As part of the ''ImpulsePhysics::Matrices'' namespace, you also get access to these utility functions:
  * ''Cut2x2'', which 'cuts' a 2x2 matrix out of a [[3x3_matrix|3x3 matrix]]
  * ''Minor''
  * ''Cofactor''