Use a for loop to alter T.X1
for numRuns = 1 : 10 % However many you want
x = [T.X1, T.X2];
mdl =fitlm(x, T.y)
% Plot stuff...
plot(x, T.y, '-');
grid on;
hold on;
% Now do something with mdl, like get T.y1.
% Now decrement T.X1 by 1 and do the next run.
T.X1 = T.X1 - 1;
end
