Hey guys I want do add two vector,the following should happen

```
Vec1 = [1 3 5 7 9]
Vec2 = [2 4 6 8]

Vec = Vec1 + Vec2  = [1 2 3 4 5 6 7 8 9]

```

Hence, the ith number of Vec2 should come between the ith and i+1 index of vec1

I've tried doing this using a for loop and using even and odd indexing. However it did not work. 

Also, doing it manually is not a option. The real vectors which I am using are quite big.

does anyone have a tip? or knows how to do it?

Thanks guys!