How to sort vector alternatively

I have a vector a=[1 3;3 4;3 6;4 8]; I want to alternatively sort matrix ‘a’ row wise (second column), i.e Highest element in second column should be row 1; second to highest element in second column shall be last row; third to highest element in second column shall be second row; and so on So, output shall be [4 8;3 4;1 3;3 6] Thanks

This command is working for sorting in order only b=sortrows(a,-2);

Answer 1

[Stephen23]

>> a = [1,3; 3,4; 3,6; 4,8]
a =
     1     3
     3     4
     3     6
     4     8
>> tmp = sortrows(a,2);
>> [tmp(1:2:end,:);flipud(tmp(2:2:end,:))]
ans =
     1     3
     3     6
     4     8
     3     4

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