public void Drot(DoubleMatrix1D x, DoubleMatrix1D y, double c, double s) { x.CheckSize(y); DoubleMatrix1D tmp = x.Copy(); x.Assign(F1.Mult(c)); x.Assign(y, F2.PlusMult(s)); y.Assign(F1.Mult(c)); y.Assign(tmp, F2.MinusMult(s)); }