Calculate t maximums in single vector
1 view (last 30 days)
Show older comments
I have an iterative program for linear block codes (k,n), and at some point, I add code-words base10
The addition result in a vector of size (1,n)
I need to find the maximum (t) elements in this vector without going into loops operations, as the time of program execution is very important.
Example: if my Vector is (V)=(1,n)
V=[68 61 35 37 18 80 50 36 78 24 85 82 85 38 39 87 47 58 70 97 55 64 58 93 87 17 18 25 76 20 99 71]
I want a direct command that can calculate the maximum 5 elements of the Vector (V).
Kindly help.
0 Comments
Accepted Answer
Star Strider
on 3 Dec 2016
You can always create your won function file from this code to produce your ‘direct command’:
V=[68 61 35 37 18 80 50 36 78 24 85 82 85 38 39 87 47 58 70 97 55 64 58 93 87 17 18 25 76 20 99 71];
Vs = sort(V,'descend');
Out = Vs(1:5)
Out =
99 97 93 87 87
4 Comments
Star Strider
on 3 Dec 2016
My apologies for the delay. The other option would be to ask for two outputs from the sort function. The second will give you the indices of the sorted elements in the original vector.
From the documentation:
- [B,I] = sort(_) also returns a collection of index vectors for any of the previous syntaxes. I is the same size as A and describes the arrangement of the elements of A into B along the sorted dimension. For example, if A is a numeric vector, B = A(I).
More Answers (1)
John D'Errico
on 3 Dec 2016
Sort them. Then take the first 5 elements from the sort. WTP?
No. It is not ONE single command. Not an option. Of course, nothing stops you from writing a function that does exactly that, in which case it will be one line.
1 Comment
See Also
Categories
Find more on Shifting and Sorting Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!