MATLAB: How to reverse “sort”

sort

For example we have a row like

m=[1 6 2 8 9] [Y,I] = sort(m)

then it gives you

Y =

     1     2     6     8     9

I =

     1     3     2     4     5

But I would like to sort them from big number to small

Best Answer

Hi,

There is an extra optional argument that will do that:

>> m=[1 6 2 8 9]; [Y,I] = sort(m,'descend')
Y =
       9     8     6     2     1
I =
       5     4     2     3     1
>>

Related Solutions

MATLAB: Strange behavior of “sort” function

Your first example is just a coincidence, but that is NOT the correct way to get the original vector order.

The correct way to get back the original vector order is like this:

>> out(idx) = out
out =
    5    8    4   19

Note that the LHS can be any array of a suitable size, I just used out for convenience.

MATLAB: Find how many times same element is repeated

A=[9,8;7,6;1,2;2,4;3,4;3,4;4,7;6,7;8,6;9,8;7,6];
a = unique(A,'rows');
R = zeros(size(a,1),1);
for k = 1:size(a,1)
    R(k) = nnz(ismember(A,a(k,:),'rows'));
end
Result = table(a,R,'VariableNames',{'Rows','Times'})

Gives:

Result =
  8×2 table
     Rows     Times
    ______    _____
    1    2      1  
    2    4      1  
    3    4      2  
    4    7      1  
    6    7      1  
    7    6      2  
    8    6      1  
    9    8      2  
>>

Best Answer

Related Solutions

MATLAB: Strange behavior of “sort” function

MATLAB: Find how many times same element is repeated

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