Can I use if ..break...else inside the same loop?
显示 更早的评论
My apology if it seems very trivial to all, but I have looked into the answers and could not find one single example which used if..break...else in the same loop. In my code, I want the value of t, where any of the variables x(t) or y(t) or z(t).... equals M (some pre set value) for the first time and then discontinue the iteration; otherwise it will return 0. So my code snippet looks like:
for i = 1:T
...
...
if x(t) == M || y(t) == M || z(t) == M || a(t) == M || b(t) == M
target = t;
break
else
target = 0;
end
end
I got some suspicious answers, so I was thinking whether the problem is in the use of break or the random probabilities I used in my code. Thanks.
2 个评论
per isakson
2015-10-21
编辑：per isakson
2015-10-21
- The use of break looks ok!
- "I got some suspicious answers". How come "suspicious" ?
采纳的回答
Your code looks fine. However, you can simplify the structure by adding target = 0; before your loop and omitting the else statement.
You might also consider using find(X==M,1), replacing X with each of your variables and then using min to find the index of the first occurrence of M, equivalent to your iterator i when you hit the break statement.
In any case, your use of if...break...else is not incorrect.
4 个评论
Bee
2015-10-22
Robert
2015-10-22
You are welcome. In your question, you iterate over i = 1:T. Was that supposed to be t = 1:T? If so, your comment above is close, but not quite there. Also, I now see that your comment matches my suggestion, which also needs to be tweaked. I will update it so I don't mislead other readers who might not check the comments.
The find function looks for anything that evaluates to true (in other words anything but zero). If it is important to your code, check doc find to see what it does with nan. So to find values of N, we need to use
target = min([find(x==N,1), find(y==N,1), find(z==N,1)])
Guillaume
2015-10-22
A possibly more efficient way of achieving the same result:
target = find(any([x;y;z;a;b] == M), 1); %assuming x,y,etc. are row vectors.
Less to type anyway.
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