"For this example, I am trying to end up with 10 new imageDataStores, trainImgs1, trainImgs2,...,testImgs1, testImgs2,...,testImgs5."
Do NOT do that (unless you want to force yourself into writing slow, complex, inefficient code):
"Any advice?"
Use basic, simple, neat, and very efficient indexing, just like MATLAB is designed for. For example, using cell arrays:
N = 5;
trainImgs = cell(1,N);
testImgs = cell(1,N);
for k = 1:N
[trname{k},tstname{k}] = splitEachLabel(imds,0.8,'randomized');
end
Very basic MATLAB concepts, such as how to use indexing, are explained in these tutorials:
