How many times this for loop will execute

Question

Pramit Biswas 2016-4-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281806-how-many-times-this-for-loop-will-execute

回答： Roger Stafford 2016-4-30

    count =0;
    for i=1:5
      count = count +1;
      if true
        i=i+1;
      end
    end

I want to skip some loop value depending upon conditions, for demo, I used every next time it should skip. But this is not happening. This loop executes all the 5 times.

1. Why?

2. What to do to achieve this?

for the time being for skipping 1 step used this code:

count =0; f= false;
  for i=1:5
    if f
       f = false;
       continue;
    end
    count = count +1;
    if true
       f=true;
    end
  end

but this is really awkward and somehow -ve for MATLAB, didn't expect. %HeartBroken%

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Answer 1

Roger Stafford 2016-4-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281806-how-many-times-this-for-loop-will-execute#answer_220149

As to the “why” the for-loop does not accept any changes you might make to its variable, in this case ‘i’, as it repeats. So even though you changed 'i' internally it will keep on steadily using its own count for 'i'. It you want to skip out of the loop ahead of its prescribed sequence, use the ‘break’ command.