global variable in for loop
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Hi,
I have a for loop, which has last iterative defined as the size of some matrix K, i.e.
[a,b]=size(K)
for i=1:a
CODE
end
Trouble is, the "CODE" in the for loop redefines how large K is - in particular, it decreases a. This means that the for loop experiences an "Index exceeds matrix dimensions." error. How does one go about fixing this? I thought that in the for loop I could have:
a=a-1;
everytime the "CODE" decreases the size of K, but it don't work none!
Thanks,
Linford
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采纳的回答
Walter Roberson
2012-1-18
If you are deleting the entry you are examining under some circumstances, then the easiest change is often to run the loop backwards .
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更多回答(1 个)
Jan
2012-1-18
The argument of the FOR loop is calculated once and is not influenced by the contents of the loop - in opposite to C.
You can check the exceeding index explicitely:
[a,b] = size(K);
for i = 1:a
if i > size(K, 1)
break;
end
CODE
end
Using a WHILE loop is a nice alternative:
[a,b] = size(K);
while i <= size(K, 1)
CODE
i = i + 1;
end
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