find index of last 5 largest values in cell array

I have a cell array of numbers a = {5 ; 6 ; 8 ; 8 ; 10; 1 ; 15 ; 25 ; 10 ; 35 ; 45 ; 3}

I need to find the index of last five largest values in cell array

index = 11,10,8,7,5

How can i do this ?

Thanks a lot

Answer 1

[Star Strider]

This works:

[as,idx] = sort(cell2mat(a),'descend');
result = idx(1:5);

[Gopalakrishnan venkatesan]

Thank you. How to avoid the repetition index , for example if my cell array consists of

a = {10,10,5,10,3,6,6,3,6,9,8}

index = 1, 10, 11 , 6, 3

[Star Strider]

My pleasure.

The unique function works for the second problem:

[C,idx] = unique(cell2mat(a));
result = idx(end-4:end);