Loop problem / issue with variables

Question

mt 2014-11-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/161240-loop-problem-issue-with-variables

评论： mt 2014-11-4

Hi all, I am having a little issue with my loop statement here. I want to end it when i reaches limit. If I run the code at this state and the workspace shows that limit is 5746 (which is supposed to be) but i goes on until 5747! What am I doing wrong?

i = 1;
k = 1;
sum = 0;
limit = size(junk,1); %returns 5746
   while i<limit
        if isequal(leapyear(year(i)),1)
            if isequal(month(i),2)
                for one = day(i):eomday(year(i),month(i))
                    sum = sum + data(i);
                    i = i + 1;
                end
                mean(k,1) = sum/eomday(year(i),month(i-1));
                sum = 0;
                k = k + 1;
            else
               for two = day(i):eomday(year(i),month(i))
                   sum = sum + data(i);
                   i = i + 1;
               end
               mean(k,1) = sum/eomday(year(i),month(i-1));
               sum = 0;
               k = k + 1;
            end
            for three = day(i):eomday(year(i),month(i))
                sum = sum + data(i);
                i = i + 1;
            end
            mean(k,1) = sum/eomday(year(i),month(i-1));
            sum = 0;
            k = k + 1;
        else
            for four = day(i):eomday(year(i),month(i))
                *sum = sum + data(i);*
                i = i + 1;
            end
            mean(k,1) = sum/eomday(year(i),month(i-1));
            sum = 0;
            k = k + 1;
        end
    end

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MA 2014-11-4

what is junk? you should specify it

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Answer 1

Guillaume 2014-11-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/161240-loop-problem-issue-with-variables#answer_157657

编辑：Guillaume 2014-11-4

在 MATLAB Online 中打开

Your code boils down to:

while i<limit
  for onetwothreefour=something:another
         i = i + 1
  end
end

which, from the point of view of i is equivalent to:

while i<limit
  i = i + (another - something) + 1;
end

Thus on each loop, i increases by an arbitrary value, eomday(...)-day(i), and it's no surprise that it can go over the limit. To stop that happening, in each for loop, you need to add: