How to use conditional statement for this case?

2017 5 13
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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

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Stephen23
Stephen23 2017-5-13

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>> 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

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