How to customize the answer of Matlab in advance?

Hello,

I have an input matrix like [a b c d e] at the start.

I order these elements in the result according to my codes but I want to predefine the first element of my result. Let's say I obtain a result such as ans = [b e d a c] but I want the first element of this matrix to be d for instance.

What should I write to achieve this kind of a result?

Thank you :)

[Azzi Abdelmalek]

What is the expected result?

[Pinar]

Actually my input matrix contains x y coordinates of cities and I obtain a distance matrix between cities by calculating the Euclidean distances. I am achieving the optimum routing between these cities in the result. I want this routing to start from the central depot. My routing is like [2 4 6 7 1 5 3 2]. These numbers stand for the city numbers. I want this routing to start from 1 (which is the central depot) and there again.

[Azzi Abdelmalek]

What do you mean by : My routing is like [2 4 6 7 1 5 3 2] ? and when you say I want this routing to start from 1 do you think it's enough to understand what you are looking for?

[Pinar]

This is a vehicle routing problem. A vehicle starts from city 2, then stops by city 4, 6, 7, 1, 5, 3 respectively and comes back again to city 2. I want that the vehicle starts its routing from city 1.

[Azzi Abdelmalek]

What are you expecting as result?

Answer 1

[Iain]

Its hard to see what you're trying to achieve, but this MIGHT be what you want to know

 > data = [a b c d e];
 > order_I_want = [4 3 2 1 5]; %
 > data(order_I_want)
     ans = [d c b a e]
 > output = sort(data) 
     output = [e b c a d];
 > order_I_want = [5 3 2 4 1]; %
 > output(order_I_want) 
      ans = [d c b e a]

[Iain]

"This is a vehicle routing problem. A vehicle starts from city 2, then stops by city 4, 6, 7, 1, 5, 3 respectively and comes back again to city 2. I want that the vehicle starts its routing from city 1."

 data = [2 4 6 7 1 5 3];
 data = data([find(data==1):end 1:(find(data==1)-1)])

Answer 2

[Azzi Abdelmalek]

a_input=[1 2 3 4 5]
a_output=[2 5 4 1 3]
a_output(a_output==4)=[];
a_output=[4 a_output]

Answer 3

[Azzi Abdelmalek]

a=[2 ,4, 6, 7, 1, 5, 3 ]
idx=find(a==1)
out=circshift(a, [0  -idx+1])

Answer 4

[Andrei Bobrov]

n = numel(a);
out = a(mod((2:n+1)-find(a == 1),n)+1);