Dynamic call to structure elements

Question

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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:

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

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Stephen23 2020-7-8

移动：Stephen23 2023-12-8

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

Answer 1

Walter Roberson 2020-7-8

1 个投票

for K = 1 : 3
    MyStruct.(sprintf('Elmt%d', K))
end

or

for K = 1 : 3
    MyStruct.("Elmt"+K)         %rely on string objects
end