Extract xy data from a structure array

I have imported a lot of xy data into a structure array. Inside the struct the last column include in each cell the xy table of one sample. How do I extract the data in a single matrix? The Matrix should have two column per sample (sample A column 1,2; sample B column 3,4...etc).

I tried a loop like this to start with:

for k = 1:numel(S)
    A(k) = table2array(S(k).data)
end

After this I wanted to try an additional loop to integrate all matrices in a single matrix

The error says: Unable to perform assigment because the left and right sides have a different number of elements.

Thank you for your help!

Answer 1

[KSSV]

You have to do a proper initialization.

If you are not aware of dimensions or if dimensions change in loop; go for cell array.

A = cell(numel(S),1) ; 
for k = 1:numel(S)
    A{k} = table2array(S(k).data)
end

You can access A using A{1}, A{2} ..A{end} etc.

If you think the dimensions do not chnage in loop and it is a matrix.

A = zeros([],[].numel(S)) ; 
for k = 1:numel(S)
    A(:,:,k) = table2array(S(k).data)
end

[KSSV]

Rene commented:

Wow, thank you very much!

The tip with A{1} was also very helpful! I added

B = [A{1:numel(S)}] and got the final matrix.