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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Réponse acceptée
Walter Roberson
le 18 Jan 2012
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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Jan
le 18 Jan 2012
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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