I need to create a bunch of fields in a struct with names that differ only by a digit, like this:
S(1).field1 = [];
S(1).field2 = [];
S(1).field3 = [];
S(1).field4 = [];
S(1).field5 = [];
This is a short version of the list. The real one is actually long and doesn't look pretty in the script so I am wondering whether I can initiate those empty fields within a for loop. I tried:
for i = 1:5
S(1).field{i} = [];
end
but it doesn't work.
Use dynamic field names: this means that S.field1 is exactly the same as S.('field1'). In action:
for k = 1:5
S(1).(['field' num2str(k)]) = [];
end
Note that I changed the loop variable to k: num2str(i) could also return 0+1i if you're not careful.
There are also some more funky, seemingly loopless solutions, such as:
n = 5;
S = cell2struct(cell(1,5),...
arrayfun(@(x) ['field' num2str(x)],1:n,'uniformoutput',false),...
2);
This will create a cell {[],[],[],[],[]} for the field values, and another cell {'field1','field2',...,'field5'} for the field names, and constructs a struct from these.
