How to extract component of vector from a struct with fields across each field

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Alberto Mora 2019-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/496485-how-to-extract-component-of-vector-from-a-struct-with-fields-across-each-field

编辑： Adam Danz 2019-12-13

采纳的回答： Adam Danz

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It is more clear if I show you my specific case (see image below).

Let's assume that I created my struct variable called "Database" with many fields (e.g. measurement number).

Is there a simple method to get a 1D vector with the second element of Database.DisplAtReferenceTemperature, across all the fields?

I wonder to have a result equal to

[4712.9 5241.9 5681.2 6053.6 9305.8]

I tried the command

Database(:).DisplAtReferenceTemperature(2)

but does not work.

The "brute force" solution is to crete a for loop that scan all the fields, but in my opinion is not very efficient.

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Adam Danz 2019-12-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496485-how-to-extract-component-of-vector-from-a-struct-with-fields-across-each-field#answer_406260

编辑：Adam Danz 2019-12-13

在 MATLAB Online 中打开

To extract all element from the DisplAtReferenceTemperature fields, add square brackets (or curley brackets to store values in a cell array).

data = [Database(:).DisplAtReferenceTemperature];

To extract the 2nd element of DisplAtReferenceTemperature from each structure in the array Database,

data = arrayfun(@(i)Database(i).DisplAtReferenceTemperature(2),1:numel(Database))

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Alberto Mora 2019-12-13

编辑：Alberto Mora 2019-12-13

Wow, thank you. Now is perfect.

Take care that in your first answer that there is still a "(2)" that have to be deleted, regarding the extraction of all the elements. Update you answer such that also the other user can find easily the solution.

Thanks a lot!

Adam Danz 2019-12-13

编辑：Adam Danz 2019-12-13

Thank you for catching that! Fixed.

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