How to add to values of a field?

How can I add values to a field without overwriting the previous entry? In a for loop

Answer 1

[Cris LaPierre]

Use your loop counter variable to specify where to add the value.

By field do you mean in a structure?

for a = 1:3
    b.field1(a) = val;
end

[Thibedi Malotana]

What if the field that I want to append is empty an instead of putting numbers in the field I put another structure

[Thibedi Malotana]

     Struct1 = struct('Cm',[])
     for n = 1:1:2
     t = dir('*Filename*.xlsx')
     t = t(n).name;
     a = size(t);
     b = a(1,2) -  5;
     t = char(extractBetween(t,20,b)); 
     t = struct(t,[])
     Struct1.Cm = t
     end
When the code is finished the only value in Cm is the last t for n = 2

[Cris LaPierre]

Structures can have many levels. Look at this doc page for more.