convert 1x5 struct to 1x6 struct in matlab

main.m
% create 1x5 struct (with 5 fields)
s1.a = 1;
s1.b = 'hello';
s1.c = [1 2 3];
s1.d = true;
s1.e = magic(3);

% create 1x6 struct (with 6 fields)
s2 = s1; % copy s1 to s2
s2.f = pi; % add extra field

% concatenate s1 and s2 using square brackets
s = [s1 s2];

% get field names
fields = fieldnames(s);

% check number of fields
numFields = numel(fields);

% remove extra field (if it exists)
if numFields > 6
    s = rmfield(s, fields{end});
end
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