MATLAB: How to loop until the user types a specific word?

Question

Ame Michael 2018-4-25

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评论： Stephen23 2018-4-25

Say I want to repeatedly ask a user what their favourite color is. I want to keep looping this statement, and have the user type their favorite color in. But, I want to exit this loop when the user types the word, "quit." How can I achieve this?

I have been looking at using while loops, but it says the matrix dimensions do not agree. Any help would be greatly appreciated. Thank you.

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Stephen23 2018-4-25

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Use strcmp to test if words match or not:

str = '';
while ~strcmp(str,'quit')
    ...
    str = input('...','s');
end

Do not use == for testing if char vectors are the same: == performs an element-wise comparison, so just like any other element-wise operation both inputs must be the same size or one of them a scalar. In any case, using strcmp is the correct tool for the job.

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Answer 1

Sigurd Askeland 2018-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/397204-matlab-how-to-loop-until-the-user-types-a-specific-word#answer_317036

在 MATLAB Online 中打开

This code should do the trick:

 response = '';
 counter = 1;
 %While loop runs until the string comparison finds  
 %that the response is equal to 'quit'.
 while(~strcmp(response, 'quit'))
     response = input('What is your favorite color? (type quit to exit) ', 's');
     favorite_colors{counter} = response
     counter = counter + 1;
 end
 %Remove quit.
 favorite_colors = favorite_colors(1:end - 1)
 disp 'Thank you!'