Check if cell contains another cell

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Marc Laub
Marc Laub 2022-10-20
评论： Jiri Hajek 2022-10-21
Hey,
I need to check if my cell contains another cell or if the contant is a character vector.
So I got a
a=1x130 cell
and
a{1}='1-v1';
a{2}='.*'
a{3}='3+v2'
a{4}=1x3 cell
...
So e need to check wether the cell content is a character vector like a{1} or a{3}, contains an operater such as a{2}, or a cell itsself with the same structure as a
Then I wanna
eval('(1-v1).*(3+v2)')
So with
ischar
I can check wether its .* or an character arry, but how do I check if its a subcell, to call the fiunction recursive?
Best regards

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采纳的回答

the cyclist
the cyclist 2022-10-20
Ran in:
a{1}='1-v1';
a{2}='.*';
a{3}='3+v2';
a{4}={'this is a cell'};
cellfun(@iscell,a)
ans = 1×4 logical array
0 0 0 1
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the cyclist
the cyclist 2022-10-20
编辑：the cyclist 2022-10-20
Ran in:
The image really isn't enough. I can't run the following code -- which exposes the fact the first cell really does contain another cell -- on your image.
load(websave("segs","https://www.mathworks.com/matlabcentral/answers/uploaded_files/1163423/testdata.mat"),"segs");
segs(1)
ans = 1×1 cell array
{1×1 cell}
segs{1}
ans = 1×1 cell array
{'1-a5pre'}
segs{1}{1}
ans = '1-a5pre'
segs(2)
ans = 1×1 cell array
{'.*'}
segs{2}
ans = '.*'
I think you were getting fooled by the fact that the Variable Editor interface seems to look inside 1x1 cells.
Marc Laub
Marc Laub 2022-10-20
Yeah, guess the variable editor shows directly the string within the cell when its a 1x1 cell...

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更多回答（1 个）

Jiri Hajek
Jiri Hajek 2022-10-20
Hi,
you can use the isa function:
isa(a{i},'cell')
Note that the use of eval is not recommended for many a good reason...
  2 个评论
Marc Laub
Marc Laub 2022-10-20
编辑：Marc Laub 2022-10-20
I know that eval is not recommended, but its just for debugging, will not be in the final code.
Somehow
isa
as well as
iscell
gives me a a logical 1 for a{1} and a{3}, but a false for a{2} nd all other muliplicaters, although those are also character arrays.
For the following data, my desired putput would be logical 1 for indices 11,15,17,... and a zero otherwise. Unfortunately; as I said, isa and iscell both give me the wrong output, when the character array start with an operater or dot, such as index 2,4,6 or 8...
Jiri Hajek
Jiri Hajek 2022-10-21
I believe you have got your answer already, as the cyclist pointed out the fact that variable viewer is not a reliable way to check the class of data, rather a viewer that helps you to analyze data. And we can trust the isa/iscell commands, which is not really surprising, considering how long they have been a part of MATLAB...

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