Ask about break function

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C Zeng
C Zeng 2012-6-6
Hi, I am writing code to break out of loop. I have several loops, including nested loops. If I use break in a if command, it will jump out of all loops, or the very nearest loop(say only one loop)?
For example:
for i=1:10
for j=1:10
f(x)=...
if f(x)>10 ...
elseif f(x)<5 break;
....
end
end
end
If f(x)<5 for some i=2 and j=3; then break will jump out of loop, go to i=3, j=1 or i=2 j=4?
Thanks.
  2 个评论
Geoff
Geoff 2012-6-10
In your last comment, I don't understand why you ask if (i,j) might go from (2,3) to (2,4) after a break with j as the inner loop. That would not be breaking at all. If you want that behaviour, use 'continue' to continue immediately from the next iteration. If you want to break out of BOTH loops from the inner loop, you need to set a flag, check it after the inner loop, and break again from there. Or use while-loops
C Zeng
C Zeng 2012-6-12
Thank you, you are right! break make the loop of j ending, and start from a new i and j, right?
continue means do nothing in the loop and go to next loop?

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Thomas
Thomas 2012-6-6
I think only the loop in which the break occurs is broken out of..
try
for ii=1:5
ii
for jj=1:6
jj
if ii==3 && jj==4
disp('broken here')
break;
end
end
end
  5 个评论
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C Zeng
C Zeng 2012-6-12
Oh, thanks! I got it.
Tomas
Tomas 2013-3-26
if you wanted to break both fors this should work. adding a flag like geof said.
flag=0;
for ii=1:5
ii
if flag==1
break
end
for jj=1:6
jj
if ii==3 && jj==4
disp('broken here')
flag=1;
break;
end
end
end

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