How to replace strings in a cell array

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012786534 2019-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/487434-how-to-replace-strings-in-a-cell-array

评论： 012786534 2019-10-25

Hello,

I an wondering how to replace strings in a cell array based on the content of the previous cell. Every time that a cell in 'input' starts with the characters QQQQ, that cell is renamed with Q_ and the content of the previous cell. For example QQQQ_01 would be renamed Q_D and QQQQ_02 would be renamed Q_E and so on. How would I do that ? The input and the desired output are illustrated below.

    input = {'A', 'B', 'C', 'D', 'QQQQ_01', 'E', 'QQQQ_02'}
    output = {'A', 'B', 'C', 'D', 'Q_D', 'E', 'Q_E'}

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Adam 2019-10-25

编辑：Adam 2019-10-25

Seems like the kind of task so specific a for loop would do the job fine.

Note that they are chars rather than strings though, a distinction which didn't used to matter in Matlab but does now that strings have been introduced as their own data type.

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Answer 1

Stephen23 2019-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/487434-how-to-replace-strings-in-a-cell-array#answer_398215

编辑：Stephen23 2019-10-25

在 MATLAB Online 中打开

>> C = {'A', 'B', 'C', 'D', 'QQQQ_01', 'E', 'QQQQ_02'}
>> X = find(strncmp(C,'QQQQ',4));
>> C(X) = strcat('Q_',C(X-1))
C = 
    'A'    'B'    'C'    'D'    'Q_D'    'E'    'Q_E'