How can I sort an array with two columns?

If I have an array of student ID in column1 and GPAs in column2

Info = [52211  3.55; 52922  1.79; 51939  3.33; 12140  0.81]

How can I sort the array from the highest GPA to the lowest GPA.

Answer 1

[Stephen23]

Very simply in one line using sortrows:

>> Info = [52211,3.55;52922,1.79;51939,3.33;12140,0.81]
Info =
                 52211                  3.55
                 52922                  1.79
                 51939                  3.33
                 12140                  0.81
>> Info = sortrows(Info,-2)
Info =
                 52211                  3.55
                 51939                  3.33
                 52922                  1.79
                 12140                  0.81

Answer 2

[KSSV]

Info = [52211  3.55; 52922  1.79; 51939  3.33; 12140  0.81] ;

[val,idx] = sort(Info(:,2),'descend') ;
iwant = Info(idx,:)

Answer 3

[Kevin Chng]

Hi,

Info = [52211  3.55; 52922  1.79; 51939  3.33; 12140  0.81];
[~,I] = sort(Info(:,2),'descend');
Info(I,:);

Done!