How do I add 1 to all even numbers and add 3 to all odd numbers in a vector?

I have no idea how to do this.I already created a vector by typing: vec = round(-10 + 35* rand(1,30)); and next I am suppose to add 1 to all the even numbers and add 3 to all odd numbers. Thank you in advance for the help.

Answer 1

[michael]

vec=vec+1+mod(vec,2)*2;

Answer 2

[Walter Roberson]

Hint:

mask1 = vec > 7
vec(mask1)  = vec(mask1) * 5