How to save to mat file sequentially using a loop and simout?

Hi everyone!

I'm getting stuck on a simple part of my code. I have a simulink simulation that exports to Workspace two outputs: Fault and Ir. I'm trying to do a loop to automatically run my simulation and save these outputs. Here's the code:

for  i = 1:100
simOut(i) = sim('mymodel');
filename1(i) = 'Fault.mat(i)';
save(filename1)
filename2(i) = 'Ir.mat(i)';
save(filename2)
end

But I'm getting:

Unable to perform assignment because the indices on the left side are not compatible with the size of the right.

How to solve this?

Thank you in advance!