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Asked by Ayob
on 20 Apr 2013

I need to create a new vector which is re-sized type of a vector and it's elements are obtained from previews vector.

for example:

V1=[1 3 9 11]

V2=[3*(1)-2,3*(1)-1,3*(1)-0,3*(3)-2,3*(3)-1,3*(3)-0,3*(9)-2,3*(9)-1,3*(9)-0,3*(11)-2,3*(11)-1,3*(11)-0]

As you can see vector V2 is made of vector V1. Each element of vector V1 in a special mode.

How can I write a code that build up V2 from V1 and be fast at the same time because I should do it several times and time is important to me.

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Answer by per isakson
on 20 Apr 2013

This is my best guess:

%% V1=[ 1, 3, 9, 11 ]; %% V2 = [ 3*V1(1)-2, 3*V1(1)-1, 3*V1(1)-0 ... , 3*V1(2)-2, 3*V1(2)-1, 3*V1(2)-0 ... , 3*V1(3)-2, 3*V1(3)-1, 3*V1(3)-0 ... , 3*V1(4)-2, 3*V1(4)-1, 3*V1(4)-0 ];

>> V2 V2 = 1 2 3 7 8 9 25 26 27 31 32 33

I submit this to learn if I'm correct so far. Can V1 take any length?

## 2 Comments

## Image Analyst

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/72849#comment_144371

What's wrong with the way you're doing it? Just replace 1 by V(1), 3 by V(2), 9 by V(3), and 11 by V(4). Should be faster than a rocket powered, greased cheetah on steroids.

## Ayob

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/72849#comment_146770

It's ugly and bring about much difficulty to check it when you have a large program like mine.