How to search a field in a structure and extract all fields that match

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Dave
Dave 2017 年 3 月 24 日
編集済み: Dave 2017 年 4 月 2 日
Hopefully I'll explain clearly as I haven't worked with structures much. I have been given a large 1x1 structure of arrays with numerous fields. I want to search one field to match a specific string. I then want to extract from the structure all fields for those cases where the string matched. I would prefer to do this with out loops. For an array of structures, I've been able to use logical indexing to access and extract data using "index2 = cellfun(@(x) any(strcmp(x, test)), {diab2.preg})" and then just index into the structure, but this doesn't work for a structure of arrays.

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Sindhu Priya
Sindhu Priya 2017 年 3 月 28 日
Hi Dave,
I think, the following code snippet will help you.
s.f1= {'Sunday' 'Monday'}
s.f2= {'Sunday' 'Monday' 'Tuesday'}
s.f3= 'Tuesday'
s.f4= 'Wednesday'
s.f5= 'Thursday'
s.f6: 'Friday'
s.f7: 'Saturday'
index2 = structfun(@(x) any(strcmp(x, 'Monday')),s)
and the generated Output is
index2 =
7×1 logical array
1
1
0
0
0
0
0
Please refer this link for more details about 'structfun'.
Regards,
Sindhu
  1 件のコメント
Dave
Dave 2017 年 4 月 1 日
Thanks Sindhu, from this and continuing to research structures I realize the data I'm given is a structure of arrays. As an example the structure data is made up of
data.Sen = {'U1'; 'U2'; 'U1'; 'U1'}
data.Tid = {'1'; '1'; '1';'2'}
data.Obj = {'U1_1';'U2_1';'U1_2';U1_1'}
data.X = {'10'; '5'; '3'; '1'}
data.Y = {'20'; '7'; '4'; '2'}
I've sort of brute forced a way to get the related data I want with
senidx = strcmp(data.Sen,'U1');
thesen = data.Sen(senidx)
theX = data.X(senidx)
theY = data.Y(senidx)
theTid = data.TID(senidx)
but I expect there is a more elegant way to do this.
I thought the following would work
for nField = 1:numel(myfieldnames)
mField = myfieldnames{nField}
mydata.(mField) = data.(mField)(strcmp(data.Sen_T,'U1'))
end
but I get this error: Struct contents reference from a non-struct array object.
I think I'm close so any further insight would be appreciated.

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