For loop to extract string with if function

Question

Benedikt Skurk 2021-5-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/834373-for-loop-to-extract-string-with-if-function

评论： Stephen23 2021-5-20

采纳的回答： David Fletcher

在 MATLAB Online 中打开

Hello,

i have a problem and already working so long on it finding no solution. I have following 2x44 string

Now i want to write a code, that check whether the first line is true or false and, depending on that, the string in line 2 should be processed differently. The 2x44 string is called E. This is my code:

for i = 1:length(E)
    if strcmp(E{1,i},'false') 
  
            str = extractBetween(Variables,"ElmSite.",".ElmTerm");
             
    elseif strcmp(E{1,i},'true')
        
            str = extractBetween(Variables,"ElmLne","Term");             
    end    
end

As a result i would like to get a 1x44 string which is called for example str and looks like the following

Can someone help me? or give me a hint how it works easier?

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Stephen23 2021-5-20

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C = {'ElmSite.1.ElmTerm'; 'ElmSite.2.ElmTerm'; 'ElmLne.3.ElmTerm'; 'ElmLne.4.ElmTerm'};
D = regexp(C,'\d+(?(?<=Lne\.\d+)[^T]+)','match','once')
D = 4×1 cell array
    {'1'    }
    {'2'    }
    {'3.Elm'}
    {'4.Elm'}

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Answer 1

David Fletcher 2021-5-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/834373-for-loop-to-extract-string-with-if-function#answer_703603

编辑：David Fletcher 2021-5-19

在 MATLAB Online 中打开

Nothing seems to be particularly wrong in the code - the only thing that stands out is that the str variable will be overwritten on each iteration so you only end up with the last value. If you want the output you have stated, you will need to save the str values as the loop progresses. Using a bit of dummy data:

a='false';
b='true';
Data{1,1}=a;
Data{1,2}=a;
Data{1,3}=a;
Data{1,4}=a;
Data{2,1}='ElmSite.1.ElmTerm';
Data{2,2}='ElmSite.2.ElmTerm';
Data{2,3}='ElmSite.3.ElmTerm';
Data{2,4}='ElmSite.4.ElmTerm';
for i = 1:size(Data,2)
    if strcmp(Data{1,i},'false') 
  
            extract{i} = extractBetween(Data{2,i},"ElmSite.",".ElmTerm");
             
    elseif strcmp(Data{1,i},'true')
        
            extract{i} = extractBetween(Data{2,i},"ElmLne","Term");             
    end    
end