Removing all elements from a struct field

2022 6 14
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更新时间：2022 6 14
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I have a struct
>> aap.acq_details.sessions
ans =
1×13 struct array with fields:
name
I want to simply make this "name" field empty, ie. remove/reset all elements in this specific field.

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Tamer Gezici
Tamer Gezici 2022-6-14
编辑：Tamer Gezici 2022-6-14
Someone answered (but now that's deleted for some reason) by saying I should do it like this:
for i=1:numel(aap.acq_details.sessions)
aap.acq_details.sessions(i).name =[];
end
However, this doesn't remove the field. It just sets it to empty array. I want to empty this struct, and put my own values. So I need it completely deleted, blank. It should not even have empty array in it.
Stephen23
Stephen23 2022-6-14
Ran in:
Ran in:
"So I need it completely deleted, blank. It should not even have empty array in it."
MATLAB does not have a "blank". The default for unallocated cells and fields is an empty array.
C{2} = pi;
C{1}
ans = []
S(2).F = pi;
S(1).F
ans = []

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Paul
Paul 2022-6-14
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Ran in:
Does rmfield meet the need?
% create a struct for example
for ii=1:13
aap.acq_details.sessions(ii).name = ii;
end
aap.acq_details.sessions
ans = 1×13 struct array with fields:
name
aap.acq_details.sessions = rmfield(aap.acq_details.sessions,'name');
aap.acq_details.sessions
ans = 1×13 struct array with no fields.

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Tamer Gezici
Tamer Gezici 2022-6-14
编辑：Tamer Gezici 2022-6-14
Yes, kind of. I already used rmfield but now the issue is, I need to create that field called "name" again. So I don't want to completely remove the field, but just clean it, purge it whaatever. And it needs to be empty so I can add new values on my own to the end of that array (append them). How can I do that?
Paul
Paul 2022-6-14
Then do what you did in the comment to the question. Once name is empty, you can do whatever you want with name.

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