Selecting specific values from a structured array

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Oliver Massaad
Oliver Massaad 2020년 12월 15일
편집: Durga Yenikepalli 2020년 12월 17일
Hi, I have a structured array with 10 fields, each one of which is a 8x1 array of symbolic values. Is there any way I can save to another array the 3rd value only of each one of these fields?

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Durga Yenikepalli
Durga Yenikepalli 2020년 12월 17일
편집: Durga Yenikepalli 2020년 12월 17일
Hi Oliver,
I understand that you want to select specific element from a structured array and save it to another array.
We can use ‘a = extractfield(S,name)’ function which returns the field values specified by the field name of structure s, and then try to extract 3rd element from the extracted field values and save to another array. Refer below code.
% Example code
% structured array with 10 fields
s = struct('f1', a1,'f2', a2, 'f3', a3, 'f4', a4, 'f5', a5,'f6', a6, 'f7', a7, 'f8', a8, 'f9', a9, 'f10', a10);
% extracting field names
fieldNames = fieldnames(s);
% preallocating array for better performance
finalArray = zeros(1,10);
% iterate and extract 3rd value from each field
for n =1:numel(fieldNames)
f = extractfield(s, fieldNames{n});
finalArray(n) = f(3);

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