Array sorting in matlab

Question

Hi i have a 289x2 array that i want to sort in MatLab. I want to sort the first column into numerical ascending order. However I want to keep the second column entry that is associated with it. Best way to explain is through an example.

x = 76  1 
    36  2 
    45  3

Now I want to sort x so that it returns an array that looks like:

x = 36  2
    45  3
    76  1

So the first column has been sorted into numerical order but has retained its second column value. So far I have tried sort(x,1). This sorts the first column as i want but does not keep the pairing. This returns x as:

x = 36  1
    45  2
    76  3

Any help would be great. Cheers!!

Sardar Usama · Accepted Answer · 2017-03-17 12:19:38Z

3

This is exactly what sortrows does.

x=sortrows(x);    % or x=sortrows(x,1);

or if you want to use sort then get the sorted indexes first and then arrange the rows accordingly like this:

[~, idx] = sort(x); %Finding the sorted indexes
x = x(idx(:,1),:) ; %Arranging according to the indexes of the first column

Output for both approaches:

edited Mar 17, 2017 at 12:19

answered Mar 17, 2017 at 12:04

Sardar Usama

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