MATLAB: How to switch two values in a matrix

Question

Hi. I have a matrix :

x = [ 6.5 7 23 24 25]
x =
      6.5000    7.0000   23.0000   24.0000   25.0000

However, the numbers inside matrix x are not in the correct spots. I need to move some of them. In order to find out which ones to move, I have to look at another matrix which is called c and c equals to:

c = [ 1 2 3 4 5 ; 
      3 2 4 1 5]
c =  
     1     2     3     4     5
     3     2     4     1     5

I want to write a code which can detect which columns in matrix c do not have the same numbers in its two rows. For example in matrix c the answer is 1st, 3rd, and 4th columns. Following is what I have done.

y = find(c(1,:)~=c(2,:));

Now this line of code helps me to find where in numbers do not match.

Now I want a code which can apply the findings of y to swap the values in matrix x.

In other words, the out put of the code that I am looking for should give me

J = blahblah(x);
J = [ 24 7 6.5 23 25];

This is very important and I have no clue how to do it.

Any help would be appreciated.

Answer 1

If I understand the method in your example correctly, then using your definition of x and c, the following should accomplish the necessary transformation using matlab's 'circshift' function:

   y = find(c(:,1)~=c(2,:));
   J = x;
   J(y) = J(circshift(y,1));