For loop combo troubles

Question

Cary 2015-10-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/247596-for-loop-combo-troubles

关闭： MATLAB Answer Bot 2021-8-20

I have the following code: When i switches to 2 how can I make j pickup where it last left off (non-nan)? For example, when i is 1, the last non-nan value is when j = 5. So when i switches to 2, how can I make j start at 6 (instead of starting at the total beginning)?

for i = 1:4
    for j = 1:14
        try
            shortIdx(j,i)=find(mid>=.20 & mid<=.30 & expiration==xDates(i) & option_type=='c' & sym==1 & quote_date==sellDate(j),1);
            longIdx(j,i)=find(ask_eod<=.05 & expiration==xDates(i) & option_type=='c' & sym==1 & quote_date==sellDate(j),1);
        catch
            warning('Nothing there')
            shortIdx(j,i)=nan;
            longIdx(j,i)=nan;
        end
    end
end

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Answer 1

Walter Roberson 2015-10-9

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start_j = 0;
for i = 1:4
    for j = start_j + 1:14
        try
            shortIdx(j,i)=find(mid>=.20 & mid<=.30 & expiration==xDates(i) & option_type=='c' & sym==1 & quote_date==sellDate(j),1);
            longIdx(j,i)=find(ask_eod<=.05 & expiration==xDates(i) & option_type=='c' & sym==1 & quote_date==sellDate(j),1);
            start_j = j;
        catch
            warning('Nothing there')
            shortIdx(j,i)=nan;
            longIdx(j,i)=nan;
        end
    end
end