Problem in while loop when input is characters or words

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Jian Gui 2014-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/137126-problem-in-while-loop-when-input-is-characters-or-words

评论： David Sanchez 2014-6-24

 Hi all. I am trying to make a while loops that will keep on running if the user input is a str, a number less and equal 0 or the number is longer the length of my vector. But it doesn't work, plz help:)
    deleterowStr=input('Please enter the number of the row:','s');
    deleterow=str2num(deleterowStr);
    while ~((~isempty( choiceNum) &&  deleterow <=0 || deleterow > length(W)) || strcmpi(deleterowStr,'')==1)
    disp('Invaild row number')
    deleterowstr=input('Please enter the number of the row:','s');
    deleterow=str2num(deleterowstr);
    end

thx:)

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回答（1 个）

David Sanchez 2014-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/137126-problem-in-while-loop-when-input-is-characters-or-words#answer_142059

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You do not say who is either W or choiceNum, but with the two variables in play, you can do it like this.

Watch the capital S in deleterowStr within the while loop

      deleterowStr = input('Please enter the number of the row:','s');
      deleterow = str2double(deleterowStr);
      while ~strcmpi(deleterowStr,'') || deleterow <= 0 
          disp('Invaild row number')
          deleterowStr = input('Please enter the number of the row:','s');
          deleterow = str2double(deleterowStr);
      end