Dynamic call to structure elements

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I intend to use a for loop to process iterative computation on different elements of a structure; my structure is made of:
  • MyStruct.Elmt1
  • MyStruct.Elmt2
  • MyStruct.Elmt3
  • ...
How can I dynamicaly call each element of my structure (incrementing the number : Elmt1, Elmt2,...) in order to use it in a for loop?
Thanks
  1 Comment
Stephen23
Stephen23 on 8 Jul 2020
Moved: Stephen23 on 8 Dec 2023
You can trivially access the fields of a structure using this syntax, where F is the fieldname:
S.(F)
You could use sprintf to generate the fieldnames, e,g.:
idx = 1;
fnm = sprintf('Elmt%u',idx);
MyStruct.(fnm)
Note that your code would be simpler and more efficient if you used a non-scalar structure, e.g.:
S(1).Elmt = 1;
S(2).Emlt = 22;
S(3).Emlt = 333;
then you can trivially access any element of that structure array using basic, efficeint indexing:
idx = 1;
S(idx).Emlt

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Accepted Answer

Walter Roberson
Walter Roberson on 8 Jul 2020
for K = 1 : 3
MyStruct.(sprintf('Elmt%d', K))
end
or
for K = 1 : 3
MyStruct.("Elmt"+K) %rely on string objects
end

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