I have array contain 1 column with 225 rows and I want to select 170 elements from these elements randomly and store it in another array also store the remain elements at another array, I used this code to choose randomly elements but I don't know how I can store the remain elements (55) at another array !
Code : my original array A
msize = numel(A);
firstpart = A(randperm(msize, 170))
secondpart = !!!!! ( remain elements ) % This is my question
Instead of throwing away the other elements, just get a permutation of all of them and then partition the array:
msize = numel(A);
allperm = A(randperm(msize));
firstpart = allperm(1:170);
secondpart = allperm(171:end);
You can use boolean indexing.
A = rand(255,1); % just generating an example matrix
indices = false(size(A));
indices(randsample(1:numel(A),170)) = true; % select what to keep
firstpart = A(indices);
secondpart = A(~indices);
