Remove specific entry in a cell array

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ZigzS
ZigzS 2018-1-31
评论： Jan 2022-10-11
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

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采纳的回答

James Tursa
James Tursa 2018-1-31
animals(ismember(animals,'dog')) = [];
  2 个评论
Nischal Amin
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.
Jan
Jan 2022-10-11
Ran in:
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')) = {''}
X = 1×3 cell array
{'Cat'} {'Dog'} {0×0 char}
% Or faster:
X = {'Cat', 'Dog', 'Tiger'};
X(strcmp(X, 'Tiger')) = {''}
X = 1×3 cell array
{'Cat'} {'Dog'} {0×0 char}

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更多回答（2 个）

Akira Agata
Akira Agata 2018-1-31
Another way to do it:
idx = strcmp(animals,'dog');
animals(idx) = [];
  1 个评论
Jan
Jan 2018-1-31
If only one string has to be removed, this is the fastest solution. +1

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Jan
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
显示 5更早的评论
RITESH KUMAR
RITESH KUMAR 2019-9-18
can we write element number at place of dog. it is at 2nd place. can i write 2.

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