public float length(){
  float x=this.m[0];
  float y=this.m[1];
  float z=this.m[2];
  float result=(float)Math.sqrt(x * x + y * y + z * z);
  return result;
}

public float length ( ) { float x = this . m [ 0 ] ; float y = this . m [ 1 ] ; float z = this . m [ 2 ] ; float result = ( float ) Math . sqrt ( x * x + y * y + z * z ) ; return result ; }
\ brief returns : length ( this )
