Find the last position of maximum value in a Matrix
38 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
NoNo
am 27 Nov. 2013
Beantwortet: Bradley Stiritz
am 31 Jan. 2021
Hello, I try to find the position and the value of a maximum in a Matrix (or in a vektor). There are several positions for the maximas and the function [C,I] = max(...) just return the first, but I need the last position. exists a method to find the last maximum?
0 Kommentare
Akzeptierte Antwort
Wayne King
am 27 Nov. 2013
Bearbeitet: Wayne King
am 27 Nov. 2013
You can use find() with the 'last' argument:
x = randi([1 10],100,1);
maxval = max(x);
I = find(x==maxval,1,'last');
Or for a matrix:
X = randi([1 10],20,20);
maxval = max(X(:));
[I,J] = find(X==maxval,1,'last');
0 Kommentare
Weitere Antworten (2)
Bradley Stiritz
am 31 Jan. 2021
@Wayne, is your solution vulnerable to rounding error, with floating-point input? In general, might it not be safer to use something like the following--?
epsilon = 0.0001;
I = find(abs(x-maxval)<epsilon,1,'last');
@Azzi, very clever solution but is it not hard-coded for row vectors? In order to handle column vectors as well, shouldn't the 2nd line be something like the following--?
[ii,jj]=max(fliplr(x(:)'));
0 Kommentare
Siehe auch
Kategorien
Mehr zu Characters and Strings 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!