How to use conditional statement for this case?

for example, x=[1:1:9] and I want y=x*2 for x=1,2,3, y=x+2 for x=4,5,6 and y=x*3 for x=7,8,9 so the result is y=[2,4,6,6,7,8,21,24,27]. Can anyone help me to write the correct code for this case? Thank you

Answer 1

[Stephen23]

>> x = 1:1:9;
>> y = [x(1:3)*2,x(4:6)+2,x(7:9)*3]
y =
     2     4     6     6     7     8    21    24    27

[Fariz Azhar Abdillah]

Thank you for answering :)