MATLAB: How to do leave-one-out cross validation of samples in cells

Question

Given a cell array C {1x 50}, how can I create leave-one-out loop such that in each of the 50 loops a different cell is "removed" from C and stored in a matrix, and the remaining 49 cells are vertically concatenated in another matrix(C{1};C{2};C{3};…).

So, in each loop two matrices are created; 1- vertically concatenated 49 cells 2- the 1 removed cell

Answer 1

C = num2cell(1:50);

Method One: Colon Operator

N = numel(C);
for k = 1:N
    ind = C{k}
    tmp = vertcat(C{[1:N-1,N+1:end]})
end

Method Two: setdiff

vec = 1:numel(C);
for k = vec
    ind = C{k}
    tmp = vertcat(C{setdiff(vec,k)})
end