I have been reading about logistic regression and it says that the hypothesis functions is as following: 

[![enter image description here](https://i.stack.imgur.com/9HNAY.png)](https://i.stack.imgur.com/9HNAY.png)

Theta is a vector that is transposed. If x is a scalar, then their product is a vector. How do you calculate for instance 1^[1 2 3] ?