Leave one out of an array in a for loop

Dear all

I have a program where i need to save one variable separately and concatenate i-1 elements in another variable (Then i need to perform some data analysis these two new variables). here is my code where i am concatenating all the elements.

Can anyone please help how i can edit it according to my problem.?

for i=1:30

resultFileName = sprintf('Sub%i.mat',i); % generate result filename

load(resultFileName)

Es{i} = feat'; % Make a cell array

feat_Concatenate = vertcat(Es{:}); % concatenate the array

end