for loop problem

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Mohammad Golam Kibria
for i=1:a:20
idx=find(consecutiveDiff(:,1)==val(i));
a=numel(idx);
end
i need to increment the value i as the value of a is changed. in first execute if a=5 the value of i becomes 2 not 1+5=6 . why ? can any body help?

采纳的回答

Jan
Jan 2011-10-11
when the line for i = 1:a:20 is executed it uses the value of a as it is then known, which is probably 1.
You will need something like this:
i = 1;
while i<=20
idx = find(consecutiveDiff(:,1)==val(i));
a = numel(idx);
i = i + a;
end

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