How to give ranking from highest to lowest

Hello, I have number like

Data=[5 6 9 1 5 2]

I want to rank them as: [3 2 1 6 4 5] Can any please help me How can I do this. Thanks in advance.

[amrith sg]

i got a average accuracy 79% at rank 1

from rank 2 to rank 10 , i need to find different average accuracy that should be greater than 79%

please give me the code regarding this problem

Answer 1

[Roger Stafford]

This should give you the rank you are asking for, Mekala:

   [~,p] = sort(Data,'descend');
   r = 1:length(Data);
   r(p) = r;

'r' will be the ranking.

[Image Analyst]

Data=[5 6 9 1 5 2]

Data = 1×6

5 6 9 1 5 2

% I want to rank them as: [3 2 1 6 4 5] 
[~,p] = sort(Data,'descend');
r = 1:length(Data);
r(p) = r

r = 1×6

3 2 1 6 4 5

Answer 2

[Azzi Abdelmalek]

Data=[5 6 9 1 5 2]
[sd,r]=sort(Data,'descend')
sd % sorted data
r % the corresponding indices

[Mekala balaji]

No, sir, by this code I am getting rank as 3 2 1 5 6 4 but I want as 3 2 1 6 4 5

Thanks and please help

[Azzi Abdelmalek]

You said from the highest to the lowest:

sd = 9     6     5     5     2     1
r =  3     2     1     5     6     4

your result is false, because the fifth element is not the lowest

[Roger Stafford]

@Azzi: The 'rank' is the inverse of the index vector that 'sort' returns. That is, in the requested 3 2 1 6 4 5, the 6 in position 4 indicates that the element in the 4th position of Data is of the 6th rank, the 5 in position 6 indicates that the 6th position in Data is of the 5th rank, etc. Thus the positions and ranks are reversed from sort's returned 2nd argument.

[Azzi Abdelmalek]

Ok Roger, I understand now.

[Azzi Abdelmalek]

We can get the result by sorting the indices resulting from the first sort

Data=[5 6 9 1 5 2]
[~,ii]=sort(Data,'Descend')
[~,r]=sort(ii)

Answer 3

[Sandeep Sai Kiran]

Data =[4 8 9 4 7 4] 

Data = 1×6

4 8 9 4 7 4

Kal = sort(Data , 'Descend') 

Kal = 1×6

9 8 7 4 4 4

Kapil =sort(Kal)

Kapil = 1×6

4 4 4 7 8 9

Answer 4

[Zalán Kocsis]

Here's one that assigns the same rank to same values (ties):

Data=[5 6 9 1 5 2]; 
[C,~,ic] = unique(Data,'sorted'); % ic are ranks from lowest to highest ; C are unique values
r=(1+max(ic)-ic);  % r: rank (highest receives 1; lowest receives length(C); tied values receive same rank)
[Data;r']

ans = 2×6

5 6 9 1 5 2 3 2 1 5 3 4

[HB]

Thanks!

Answer 5

[ASWIN]

A=ones(4);
m=length(A);
r=rank(A)

r = 1

[Dyuman Joshi]

That rank() is different from what OP is asking about.

[Image Analyst]

By "ranking" he really meant sorting. Your solution does not give the answer of [3 2 1 6 4 5] that he asked for.