How to find prefix and postfix in a recursive way

Question

cat cat 2016-1-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263458-how-to-find-prefix-and-postfix-in-a-recursive-way

编辑： Stephen23 2016-1-12

matlab.mat

Hi! I have a array of strings: I want to find prefix and postfix; after find postfix I want to find prefix and postfix of it and so on.

Example
strings     prefix   postfix   ---> prefix  postfix ---> prefix  postfix ---> prefix  postfix
23414        2        3414          3         414         4         14           1      4
342(1)       3        42(1)         4         2(1)        2         (1)          1
34           3        4             4          
231          2        31            3         1           1

I have tried to do it with this code:

semanticTrajCompact(1,4).TrajCompact=(semanticTrajCompact(1,4).TrajCompact(~cellfun('isempty',semanticTrajCompact(1,4).TrajCompact)));
semanticTrajCompact(1,4).TrajCompact=sort(semanticTrajCompact(1,4).TrajCompact);
for k=1:size(semanticTrajCompact(1,4).TrajCompact,1)
    if ~isempty(semanticTrajCompact(1,4).TrajCompact{k,1})
        if semanticTrajCompact(1,4).TrajCompact{k,1}(1)=='('
            PrefixPostfix(1,4).prefix{k,1}=semanticTrajCompact(1,4).TrajCompact{k,1}(2:3);
            PrefixPostfix(1,4).postfix{k,1}=semanticTrajCompact(1,4).TrajCompact{k,1}(5:end);
        else
            PrefixPostfix(1,4).prefix{k,1}=semanticTrajCompact(1,4).TrajCompact{k,1}(1);
            PrefixPostfix(1,4).postfix{k,1}=semanticTrajCompact(1,4).TrajCompact{k,1}(2:end);
        end
    end
end
prefixTree(1,4).prefixTree(:,1)=semanticTrajCompact(1,4).TrajCompact;
prefixTree(1,4).prefixTree(:,2)=PrefixPostfix(1,4).prefix;
prefixTree(1,4).prefixTree(:,3)=PrefixPostfix(1,4).postfix;

After I have a problems to find prefix and postfix to leave from the result of

prefixTree(1,4).prefixTree(:,3)=PrefixPostfix(1,4).postfix;

Can you help me?

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Answer 1

Stephen23 2016-1-12

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/263458-how-to-find-prefix-and-postfix-in-a-recursive-way#answer_205862

编辑：Stephen23 2016-1-12

在 MATLAB Online 中打开

C = {'23414','342(1)','34','231'};
pfx = cellfun(@(s)regexp(s,'\d','match'),C,'UniformOutput',false);
fun = @(s)arrayfun(@(n)s(n:end),regexp(s,'(\d|\(\d\))'),'UniformOutput',false);
sfx = cellfun(fun,C,'UniformOutput',false);

and the two output cell arrays contain:

>> pfx{:}
ans = 
    '2'    '3'    '4'    '1'    '4'
ans = 
    '3'    '4'    '2'    '1'
ans = 
    '3'    '4'
ans = 
    '2'    '3'    '1'
>> sfx{:}
ans = 
    '23414'    '3414'    '414'    '14'    '4'
ans = 
    '342(1)'    '42(1)'    '2(1)'    '(1)'
ans = 
    '34'    '4'
ans = 
    '231'    '31'    '1'