docs: public static ZMatrixRMaj createReflector(ZMatrixRMaj u ) {
          if( !MatrixFeatures_ZDRM.isVector(u))
              throw new IllegalArgumentException("u must be a vector");
  
          double norm = NormOps_ZDRM.normF(u);
          double gamma = -2.0/(norm*norm);
  
          ZMatrixRMaj Q = CommonOps_ZDRM.identity(u.getNumElements());
  
          CommonOps_ZDRM.multAddTransB(gamma,0,u,u,Q);
  
          return Q;
      }