Dynamic call to structure elements

30 views (last 30 days)
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
Edited: Stephen23 on 8 Jul 2020
Those are not elements of a structure, those are fields of a structure.
Your example structure has only has one element (because it is scalar) and has multiple fields.
A non-scalar structure has multiple elements, totally independent of how many fields it has.
I recommend revising the basic concepts: https://www.mathworks.com/help/matlab/structures.html

Sign in to comment.

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

More Answers (1)

Stephen23
Stephen23 on 8 Jul 2020
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

Categories

Find more on Structures in Help Center and File Exchange

Products


Release

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!