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How does 'break' work?

30 vues (au cours des 30 derniers jours)
Sherwin
Sherwin le 27 Oct 2016
Commenté : Sherwin le 27 Oct 2016
Hi, I need to know what happens after "break"? what does the loop skip to? I need it to skip to "for i = 1:50" and start from a new i. Please help me.
for i = 1:50
if a {i,5}(1) <= a{1,4}(1)
b{i,1} = a{1,1};
else
for j = 1:50
if a {i,5}(1) >= a{j,4}(1) && a{i,5}(1) <= a{j+1,4}(1)
b{i,1} = a{j+1,1};
break
end
end
end
end
  2 commentaires
Adam
Adam le 27 Oct 2016
doc break
is a useful start.
Sherwin
Sherwin le 27 Oct 2016
Thank you.

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Réponse acceptée

James Tursa
James Tursa le 27 Oct 2016
Modifié(e) : James Tursa le 27 Oct 2016
The "break" statement breaks out of the "innermost" loop that it is inside of. In your code above, it will break out of the for j=1:50 loop and start executing at the next line after the "j loop" end statement. This next statement happens to be the end statement in an else clause. Since there is no "i loop" code after this end statement other than the "i loop" end statement, this break will effectively cause the for i=1:50 loop to skip to the next i also.
  3 commentaires
James Tursa
James Tursa le 27 Oct 2016
Yes. Right after b{i,1} is assigned, it will break out of the "j loop". The next statement it hits is the "end" associated with the "else" block. So it exits this "else" block. The next statement it hits is the "end" associated with the "i loop". So this will effectively cause the code to skip to the next "i" iteration.
Sherwin
Sherwin le 27 Oct 2016
Thank you so much!

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Plus de réponses (1)

Walter Roberson
Walter Roberson le 27 Oct 2016
"break" lets some of the Magic Smoke out of your loop. It is sort of like letting some of the air out of your tires -- while you are driving on the highway!
  1 commentaire
Sherwin
Sherwin le 27 Oct 2016
Beautiful metaphor! Thank you :)

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