Is it possible to put an if statement into a for loops counter?
3 ビュー (過去 30 日間)
古いコメントを表示
I need a counter that stops at one of two values, which ever is reached first.
Example
for r=1: (if statement here)
for c=1: (if statement here)
do things
end
end
I've tried achieving what I need with two nested while loops:
while r < r1 && r < r2
r=r+1
while r < r1 && r < r2
c=+c+1
if condition
else
stuff
end
end
end
but the first while loop just counts through all it's iterations and then moves onto the 2nd while loop, rather than counting once then moving into the 2nd while loop until that condition is met.
2 件のコメント
James Tursa
2016 年 6 月 22 日
It isn't clear to me yet how you want the counters to behave. Do you want r to count until a condition is met, and then for that r value count c until a different condition is met? Or do you want r and c to count together somehow until a condition is met? Once the condition(s) are met, do you continue counting both counters or does one of them start over? etc.
dpb
2016 年 6 月 22 日
"first while loop just counts through all its iterations and then moves onto the 2nd while loop rather than counting once then moving into the 2nd while..."
That's simply not so...the first loop iterates once, enters the second which is infinite since it never increments the test variable r.
採用された回答
dpb
2016 年 6 月 23 日
編集済み: dpb
2016 年 6 月 23 日
"need a counter that stops at one of two values, which ever is reached first."
while r < r1 && r < r2
r=r+1
while r < r1 && r < r2
...
This doesn't need a nested loop or any other exotic IF cases, simply
for r=initialCount:min(r1,r2)
...
If r1,r2 can change inside the loop, then you need a while construct instead because the for iteration limits are set on entry to the construct and not altered even if the variables are.
>> r1=3;
>> for r=1:r1
disp([r r1])
if r==1, r1=5; end
end
1 3
2 5
3 5
>>
As you can see, the loop only ran 3 iterations, not 5.
Also see
doc break % to terminate a loop
It can, of course, be included in an if construct that is a complex as needed on any variables needed.
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Loops and Conditional Statements についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!