editing a cell in a loop

Question

Max 2015-11-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253743-editing-a-cell-in-a-loop

编辑： Geoff Hayes 2015-11-8

If I have a 1 column cell

x=
'dog'
'at'
'cat'
'four'
'creative'

How do I write code that removes the words based on their length of letters. Like say I input n=1 it removes all words with letter 1 then n=2 it would remove all words with letter 2 so it would remove 'at' then n=3 removes all words with letter 3 so removes 'cat' and 'dog' leaving

x=
'four'
'creative'

Thanks

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Answer 1

Geoff Hayes 2015-11-8

0
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https://ww2.mathworks.cn/matlabcentral/answers/253743-editing-a-cell-in-a-loop#answer_198932

在 MATLAB Online 中打开

Max - use cellfun to apply a function to each element in your array. In your case, you could use the length function to determine the lengths of each string or to determine which strings are a certain number of characters long. For example, using your x from above

 n    = 2;
 idcs = cellfun(@length(str)==2,x);

will return

which tells us that the second string in x is of length two. We can then remove that string easily enough by doing

x(idcs) = [];

The above call to cellfun takes an anonymous function as its first input parameter

@(str)length(str)==2

where str is a string element from our cell array x. We calculate the length of str and compare it to two, so that the output from this call is logical (true or false).