Output names for splitEachLabel() in a for loop

Hello,

I have an imageDataStore (called "imds" with two unique labels. I am wanting to split the imds multiple times, and would like to keep track of the output. Right now I have:

for i=1:5

trname=strcat("trainImgs",string(i));

tstname=strcat("testImgs",string(i));

[trname,tstname]=splitEachLabel(imds,0.8,'randomized');

end

But this just ends up creating two new imageDataStores trname and tstname from the final loop. I am understanding that this is happening because the output of splitEachLabel is assigning values to trname and tstname, and not the characters I assigned them I intended. But I am struggling to fix this. For this example, I am trying to end up with 10 new imageDataStores, trainImgs1, trainImgs2,...,testImgs1, testImgs2,...,testImgs5.

Any advice?

Thank you

Answer 1

[Stephen23]

"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):

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

"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

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

Very basic MATLAB concepts, such as how to use indexing, are explained in these tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

[Reid Demass]

Thank you!