How to save output from iteration?
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
i have an array a=[1;2;2;3;4;4;4;4]; when i type
for i=1:3
[~,col]=find(a==1)
end
it only results col=1, i wanna save all of the col, it's like
col=1
1
1
what should i do? thank you
2 commentaires
Leah
le 22 Avr 2013
it's not clear what you are looping over since "i" does not appear inside the for loop. Also your desired output for col, doesn't really make sense since 1 only appears in the first entry of a. What do the three outputs for col mean?
Matt Kindig
le 22 Avr 2013
@Tara: For what it's worth, you can accomplish the same thing more efficiently by using ismember(), as:
[temp,locs]=ismember(a, 1:3);
% 'locs' will contain positions where 1,2,and 3 are found in 'a'
Réponses (1)
Walter Roberson
le 22 Avr 2013
for i = 1 : 3
[~, col{i}] = find(a==1);
end
Notice the switch to cell arrays. This is needed because any given value might occur 0, 1, or many times instead of exactly once.
Also notice you are doing exactly the same "find" each time. Perhaps you wanted to find over a(i,:) ?
1 commentaire
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements 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!