How to simulate ARIMA from residuals?

I know that we can get the residuals of the model by the following function:

res = infer(fit,Y);

Now if we have residuals named

res

and model

fit

how can we get the values of Y? Thanks

Answer 1

[Roger Wohlwend]

You can't do that. It is not possible to infer Y from the residuals. Why do want to do that? You already have Y.