var b, c: Vector; bv: TVec; begin b := Vector(TDoubleArray.Create(1,1,1,1)); b = [1,1,1,1]; bv := b; // b and bv point to same data object bv.Scale(2); TVec(b).Scale(2); //an alternative way to scale c := b*2 + Cplx(2,3); c := b*2 + 2 + 3i c := b*bv; mix Vector and TVec bv.Add(c); //pass Vector type and implicitely convert to TVec end;