Sorting data points so x are in ascending order.

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David
David 2013-12-3
编辑： Viktor 2013-12-3
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].

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回答（3 个）

Jos (10584)
Jos (10584) 2013-12-3
编辑：Jos (10584) 2013-12-3
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
Viktor
Viktor 2013-12-3
编辑：Viktor 2013-12-3
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.
Andrei Bobrov
Andrei Bobrov 2013-12-3
[x1,ii]= sort(x);
y1 = y(ii);

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