Change loop conditions when condition passed

Question

DP 2020-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/546671-change-loop-conditions-when-condition-passed

评论： DP 2020-6-11

采纳的回答： David Hill

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Hi everyone,

I'm trying to modify this loop for when an elseif condtion is executed ONCE, another condtion will be passed.

Basically, tf_r1 is a logic matrix that goes like this: 0 0 1 0 0, after my code hits 1, I want it to recongize the upcoming 0 as something else.

    for k=1:5
        if tf_r1(k) == 0
           strcat('SF in Row 1 Column', num2str(k))
        elseif tf_r1(k) == 1
          strcat('NA in Row 1 Column', num2str(k))
% When the above elseif is executed ONCE, then execute this:
           tf_r1(k) == 0
           strcat('TA in Row 1 Column', num2str(k))
        end
    end

Thank you!

-DP

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Answer 1

David Hill 2020-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/546671-change-loop-conditions-when-condition-passed#answer_449831

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I misunderstood you.

flag=0;
for k=1:5
        if tf_r1(k) == 0 && ~flag
           strcat('SF in Row 1 Column', num2str(k))
        elseif tf_r1(k) == 1 
          strcat('NA in Row 1 Column', num2str(k))
          flag=1;
        elseif tf_r1(k)==0 && flag
            tf_r1(k) == 0
            strcat('TA in Row 1 Column', num2str(k))
        end
end

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DP 2020-6-11

Ah, that makes more sense. Works perfectly!

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Answer 2

David Hill 2020-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/546671-change-loop-conditions-when-condition-passed#answer_449818

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Just add a flag

flag=0;
for k=1:5
        if tf_r1(k) == 0
           strcat('SF in Row 1 Column', num2str(k))
        elseif tf_r1(k) == 1
          strcat('NA in Row 1 Column', num2str(k))
% When the above elseif is executed ONCE, then execute this:
           if ~flag
               tf_r1(k) == 0
               strcat('TA in Row 1 Column', num2str(k))
               flag=1;
           end
        end
    end

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DP 2020-6-11

编辑：DP 2020-6-11

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Hi David,

Thank you for your help. I executed the flag you mentioned, but it did not change the response.

Here are the answers:

ans =
    'SF in Row 1 Column1'
ans =
    'SF in Row 1 Column2'
ans =
    'NA in Row 1 Column3'
ans =
  logical
   0
ans =
    'TA in Row 1 Column3'
ans =
    'SF in Row 1 Column4'
ans =
    'SF in Row 1 Column5'