How do I extract data from a structure and put them all in one single array?
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Luis Ricardo Rivera Goitia
il 12 Apr 2023
Commentato: Image Analyst
il 12 Apr 2023
I have a 1X31 struct with two fields, I would like to extract all the data from the second one, and put them all in one single array.
How can I do that?
Here are some images to illustrate how they are arranged.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1353359/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1353364/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1353369/image.jpeg)
So what I want to do is to create an array that contains dataTT(1).Data + dataTT(2).Data + ... dataTT(n).Data
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Stephen23
il 12 Apr 2023
2 Commenti
Stephen23
il 12 Apr 2023
Modificato: Stephen23
il 12 Apr 2023
I guess your next request will be to convert that string data into numeric... Here are some approaches:
S = ["{1.23,4.56,7.89}";"{9.87,6.54,3.21}";"{12.3,45.6,78.9}";"{98.7,65.4,32.1}"]
M = sscanf([S{:}],'{%f,%f,%f}',[3,Inf]).'
M = double(split(replace(S,["{","}"],''),','))
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Image Analyst
il 12 Apr 2023
Modificato: Image Analyst
il 12 Apr 2023
You forgot to attach your data in a .mat file with the paperclip icon so we can't try it with your data. You can try these things:
v = {dataTT.Topic}
or
v = vertcat(dataTT.Topic)
Same for the Data field
2 Commenti
Image Analyst
il 12 Apr 2023
You're welcome. Just additional info to extend this into future situations you might encounter: If the numbers were single numbers, not cell arrays of 3 numbers then you could do
v = [structName.fieldName] % Concatenate all fields into a single vector.
For a real world example, where mask is a binary image with several "blobs" that you want to measure the area of:
props = regionprops(mask, 'Area'); % Returns a structure with "Area" as a field of the structure.
allAreas = [props.Area]; % Concatenate all areas into a single double vector.
I use it that way all the time.
If my replies helped you, perhaps you could click the "Vote" icon. 🙂
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