find the non zero minimum and return the index
37 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
yu yue
le 21 Oct 2016
Réponse apportée : Star Strider
le 21 Oct 2016
I have a matrix
x = [12 10 0 6]
I need to find the non zero minimum and return the index of this non zero minimum, I have wrote
[A,I]=min(x(x>0))
It return that
A=6; I=3;
How can I get
A=6; I=4
? Thank you.
0 commentaires
Réponse acceptée
Star Strider
le 21 Oct 2016
If you want to temporarily change ‘x’, this works:
x = [12 10 0 6];
x(x == 0 ) = NaN;
[A,I] = min(x)
A =
6
I =
4
You can then change the NaN back to a zero if you want to:
x(isnan(x)) = 0
x =
12 10 0 6
0 commentaires
Plus de réponses (2)
Image Analyst
le 21 Oct 2016
Try this:
% Setup
rows = 4; % Whatever you want.
columns = 4; % Whatever you want.
sigma1 = .5
m = sigma1*randn(rows, columns)
% Now begin:
% Set negative to inf
m(m<=0) = inf
minValue = min(m(:)) % Find min.
[rowOfMin, colOfMin] = find(m == minValue) % Find row and col of min.
0 commentaires
Swarooph
le 21 Oct 2016
One answer could be, set anything 0 or less to NaN and directly use the min function.
x = [12 10 0 6]
x1 = x; %Copy x into x1 if you don't want to lose x1
x1(x<=0) = NaN %Set anything <= 0 to NaN
[A,I]=min(x1) %Find min value and index
Now A = 6 and I = 4.
0 commentaires
Voir également
Catégories
En savoir plus sur Matrix Indexing dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!