create and display a cell array that have a same length of requiremant

Question

jarvan 2014-11-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163002-create-and-display-a-cell-array-that-have-a-same-length-of-requiremant

评论： jarvan 2014-11-18

I a writting a script that will create and display a cell array that will loop to store strings of lengths 4, 5, 6, and 7. it will ask the user for the string and also make a error-check. for example:

Enter a string of length 5: hello
Enter a string of length 6: !@#$%^
ncell{2} =
hello
Error: String has wrong length
ncell{3} =
!@#$%^

Here is my code

stringlength = cell(4,1); 
n = 4;
for i = n:7
    stringlength{i} = input('Enter a string of length :','s')
    if length(stringlength) ~= i
          disp('Enter the right one')
      else
          stringlength{i} = input('Enter a string of length :','s')
  end
  end

However, the code seems wrong because it keeps going although I put in a wrong length of strings

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Answer 1

Guillaume 2014-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/163002-create-and-display-a-cell-array-that-have-a-same-length-of-requiremant#answer_159197

在 MATLAB Online 中打开

length(stringlength) is the length of the cell array, so it's 4. So your

if length(stringlength) ~= i

will always be true on the first iteration of the loop ( i = 4) and false all the others ( i=5:7).

You forgot to index in the cell array. To test the length of the string:

length(stringlength{i})

Note that there's a flaw in your program. If the user fails to enter a string of the right size, you ask him again to enter a string of the right size. The second time round, you don't check it, so any size can be entered.