invert method
Invert the matrix. Returns the determinant.
Implementation
double invert() {
final double det = determinant();
if (det == 0.0) {
return 0.0;
}
final double invDet = 1.0 / det;
final double temp = _m2storage[0];
_m2storage[0] = _m2storage[3] * invDet;
_m2storage[1] = -_m2storage[1] * invDet;
_m2storage[2] = -_m2storage[2] * invDet;
_m2storage[3] = temp * invDet;
return det;
}