Remove specific entry in a cell array
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I want to remove an entry in a cell array if it is equal to something specifically. Explained in this example:
animals={'cat', 'dog', 'mouse', 'horse'};
"animals" is being redefined in a loop, and if it happens to be redefined with 'dog' as an entry, I want to remove it. So I want
animals={'cat', 'mouse', 'horse'};
I don't want to replace 'dog' with a blank (''), I want to remove that entry entirely and keep the array tight (i.e. reduce the dimensions from 4x1 to 3x1 in this case).
Thanks
采纳的回答
James Tursa
2018-1-31
animals(ismember(animals,'dog')) = [];
2 个评论
Nischal Amin
2022-10-10
This does not work for me.
X = ('Cat', 'Dog', 'Tiger');
X = X(ismember(X,'Tiger')) == []
X should be 'Cat', 'Dog', Empty cell
Basically, I don't want the X index to change. I just want to remove Tiger. So, when I do unique(X)...it displays only Cat and Dog.
X = ('Cat', 'Dog', 'Tiger') is no valid Matlab syntax. For a cell array you need curly braces, not parentheses.
X(ismember(X,'Tiger')) == [] compares the cell {'Tiger'} with the empty matrix. It does not set anything to the empty cell.
X = {'Cat', 'Dog', 'Tiger'};
X(ismember(X,'Tiger')) = {''}
% Or faster:
X = {'Cat', 'Dog', 'Tiger'};
X(strcmp(X, 'Tiger')) = {''}
更多回答（2 个）
Akira Agata
2018-1-31
Another way to do it:
idx = strcmp(animals,'dog');
animals(idx) = [];
1 个评论
Jan
2018-1-31
If only one string has to be removed, this is the fastest solution. +1
Jan
2018-1-31
animals = {'cat', 'dog', 'mouse', 'horse'};
animals = setdiff(animals, {'dog'})
This would allow to remove multiple elements at once.
7 个评论
jaah navi
2018-10-28
I tried with your command in the following code:
code:
C = partitions([5 7 8 50])
partitions = setdiff(partitions, {'5','7'}).But i am getting error.
could you please help me to remove {'5','7'}.
Jan
2018-10-31
Please post the error message instead of only mentioning, that there is one. By the way, which partitions do you mean? This is not a function of the Matlab toolboxes, so we cannot know, what you are talking of. At least it looks strange, that the input of this function is numeric, and you expect the output to be a cell string.
Peter Jarosi
2019-7-10
编辑：Peter Jarosi
2019-7-10
setdiff() unexpectedly sorts cells. What if I dont want this side effect?
animals = {'cat', 'dog', 'mouse', 'horse'};
animals = setdiff(animals, {'dog'})
animals =
'cat' 'horse' 'mouse'
OK, I found the answer, using 'stable' option. Nice! I really appreciate your idea. Thanks!
animals = {'cat', 'dog', 'mouse', 'horse'};
animals = setdiff(animals, {'dog'}, 'stable')
animals =
'cat' 'mouse' 'horse'
Jan
2019-7-11
@Peter: If you want to remove one string only:
animals = {'cat', 'dog', 'mouse', 'horse'};
animals = animals(~strcmp(animals, 'dog'))
Peter Jarosi
2019-7-11
@Jan: Actually I applied your idea for removing more than one string from a cell array. (I just used your example to illustrate the problem of sorting.) In my opinion the most convenient method is yours extending with 'stable' option, if we want to remove more than one strings and keep the original order of the remaining elements.
RITESH KUMAR
2019-9-18
can we write element number at place of dog. it is at 2nd place. can i write 2.
Arpit Agarwal
2020-1-9
cool
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