Sorting data points so x are in ascending order.

I have two vectors x and y and they correspond to a given set of data points. How can I sort x in ascending order while at the same time, sorting y so that the values of y match up with their corresponding values of x?? Eg. (1,2) (3, 0) (-4, 6) (-2, 5) would yield vectors x = [1,3,-4,-2] and y = [2,0,6,5] then the sorted vectors would be x = [-4,-2,1,3] and y = [6,5,2,0].

Answer 1

[Jos (10584)]

Use the second output of SORT

% example data
X = [1  3 -4 -2] 
Y = [2  0  6  5]

[sortedX, sortIndex] = sort(X)
sortedY = Y(sortIndex)

Another option would be via SORTROW

Answer 2

[Viktor]

You have a sortrows() function that you can use. Assuming you have two row vectors:

    sorted = (sortrows([x',y'], 1))'
    % reassigning sorted values
    x = sorted(1,:);
    y = sorted(2,:);

I just noticed that Jos has already mentioned, I left my answer here, it might be useful.

Answer 3

[Andrei Bobrov]

[x1,ii]= sort(x);
y1 = y(ii);