Prerequisites
Determinants are explained here:
det = m11 m22 m33 + m12 m23 m31 + m13 m21 m32  m11 m23 m32  m12 m 21 m33  m13 m22 m31
The following calculator allows you to calculate the determinant for a 3×3 matrix. Enter the values into the matrix and then press "calc det >" to display the result:
// assumes matrix indices start from 0 (0,1 and 2) public double determinant() { double value = m00*m11*m22 + m01*m12*m20 + m02*m10*m21  m00*m12*m21  m01*m10*m22  m02*m11*m20; return value; }
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