When L is not unique, how can I choose any of L

let say i have a vector

S=[  7    1     15    13    2    14     6     10    12    11     4    8     3     9     5];

and after following certain procedure i got the indices of corresponding to the vector given i.e.,

L = 
     1     1     2     2     2     3     3     4     5     5     3     4     3     5     4

as it is clear from the indices that these are not unique, and I want to pick the maximum number by maximum index

I am getting wrong when i apply

z = max(L(:));
k = find(L==z,1,'last')

Thanks

[madhan ravi]

what's your desired result ?

"I want to pick the maximum number by maximum index"

from maximum index in L and extract the correponding index in S?

[Rik]

If you want an index to the maximum value, you can also use the second output of max (you can use end on that vector to select the last one). That would be equivalent to the code you wrote, so it is unclear to me as well what you mean.

[Muhammad Usman]

max (L(:)) = 5;

for that index there are three numbers in S i.e., 12, 11 and 9.

Let say i want to pick number 11

Answer 1

[madhan ravi]

[value,idx] = max(L) 
s=S(L==value)
result=s(randi([1 numel(s)],1)) %picks any of L out of three numbers

[Rik]

Why not this?

[~,idx] = max(L) 
s=S(idx)
result=s(randi(numel(s))) %picks any of L out of these numbers

[madhan ravi]

Not really because you only get one output which is 12 the max but there has to be 9,11 and 12 in which finally one amongst these three numbers have to be picked.

[Guillaume]

Yes, max only returns the index of the first value equal to the maximum, not all of them.