Finding the second smallest value in each column of an array?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
This is probably very simple. I have an array of size, say 10 by 30. In each column, there is definitely an element with a value of 0, the rest of the nine: values > 0. Now, I want a row vector containing the second smallest values from each column of the original array.
Any idea? If I were to use min(array), I would get a row vector with all 0's. Maybe I have to use bubble sorting?
Antworten (3)
Jan
am 7 Aug. 2011
Sorting is a good idea:
X = rand(10, 10);
Xs = sort(X);
min2nd = Xs(2, :);
This is not very efficient, but most likely the fastest Matlab method.
0 Kommentare
Pierre
am 7 Aug. 2011
You could simply take advantage of Bruno Luong's Min/Max selection implemented in MEX. AFAIK they implement Hoare's selection algorithm (which is a deviation of quicksort).
0 Kommentare
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!