How can I write a condition statement in for loop?

Question

zeezo 2018-2-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/383275-how-can-i-write-a-condition-statement-in-for-loop

评论： zeezo 2018-2-17

I have this code. I want if the a=>6 the code increase k by one and go back from the beginning of the for loop. how can I do it ?

 k=4;
b=[2,5,2,6,3,4,5,9,10,2,9,4,6,8,7,3,4];
c=[5,2,5,6,9,8,3,1,6,5,5,3,6,4,1,6,9];
for i=1:k
a=b(1,i)+c(1,i);
ss(1,i)=a;
if a>6 then   % this does not work 
    k=k+1
end
end
ss

The code I wrote does not work. How can I write this condition ?

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Answer 1

Image Analyst 2018-2-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/383275-how-can-i-write-a-condition-statement-in-for-loop#answer_305679

在 MATLAB Online 中打开

Try this:

kMax = 4;
thisK = 1;
maxIterations = 10000; % Some number larger than you ever expect.
b=[2,5,2,6,3,4,5,9,10,2,9,4,6,8,7,3,4];
c=[5,2,5,6,9,8,3,1,6,5,5,3,6,4,1,6,9];
loopCounter = 1;
while loopCounter <= length(c) && ...
    thisK < kMax && ...
    loopCounter < maxIterations
  a = b(loopCounter) + c(loopCounter);
  ss(loopCounter) = a;
  if a > 6
    thisK = thisK+1
  end
  loopCounter = loopCounter + 1;
end
ss

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zeezo 2018-2-17

Also why do we use kMax ?

zeezo 2018-2-17

在 MATLAB Online 中打开

I run the code but it does not come up with what I want

 kMax =5 ;
thisK = 1;
maxIterations = 10000; % Some number larger than you ever expect.
b=[2,5,2,6,3,4,5,9,10,2,9,4,6,8,7,3,4];
c=[5,2,5,6,9,9,3,1,6,5,5,3,6,4,1,6,9];
loopCounter = 1;
while loopCounter <= length(c) && ...
    thisK < kMax && ...
    loopCounter < maxIterations
  a = b(loopCounter) + c(loopCounter);
  ss(loopCounter) = a;
  if a > 9
    thisK = thisK+1;
  end
  loopCounter = loopCounter + 1;
end
ss

the result was

ss =

7 7 7 12 12 13 8 10

the condition is that it will run 5 times then in the last one if the a>9 will make anther loop. Then if the new a>9 it will run again and if it less than 9 it will stop but here a =8 and it it still running for one extra loop

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