How to index filenames correctly?

Please help if you have the answer.

I have .png images, which I want to read randomly and send to a function which will perform segmentation and then output the answer in a xls file or csv... But I doing the indexing in the beginning wrong. Here is what I want to do.

store files in Images:

Images=['image001.png'; 'image003.png'; 'image020.png';'image022.png';'image024.png';'image025.png'; 'image026.png';'image027.png';'image028.png';'image029.png';
'image035.png';'image036.png';'image038.png';'image042.png']

Then by choice have the index as follow:

Items=[1 2 5 6 9 12];

I want the 1st, the 2nd, 5th etc...

Then run a loop

for k=1:size(Items,1)
  [A,n] = Calc_Exudate(Images(Items(k)));
  %append A n to xls or csv
  dlmwrite('data.csv',[mat2str(A') ',' num2str(n)],'delimiter',',','-append');
end

With this code it select "i", because that is the 1st letter, but I want the whole file/item.

Answer 1

[Azzi Abdelmalek]

Use

[A,n] = Calc_Exudate(Images(Items(k),:));

% or use a cell array

 Images={'image001.png';'image003.png';'image020.png';'image022.png'}
[A,n] = Calc_Exudate(Images{Items(k)});

[Valeska Pearson]

thank you very much