Where do you assign a value to randSamp? Also, you probably meant to write
filename = ['randSamp' num2str(randSampNum) '.csv'];
On a sidenote, the initialization of sampSets = 1 and randSampNum = 1 is not necessary. What you are essentially doing is first initialize it as a scalar (1), and then re-define it as a vector in the for loop (e.g. sampSets = 1:100)
Also, sampSets = sampSets + 1 is not necessary, same for randSampNum = randSampNum + 1.
A simple for loop looks like this:
for i = 1:10
sprintf('This is iteration: %i \n',i)
end
This would return
This is iterations: 1
This is iterations: 2
This is iterations: 3
This is iterations: 4
This is iterations: 5
This is iterations: 6
This is iterations: 7
This is iterations: 8
This is iterations: 9
This is iterations: 10
