Oo_.endo_simul & oo_.irfs

Dear Professor Pfeifer,
I have a stochastic model with 5 socks, after the Estimation, and running stoch_simul, I check the simulated variables in oo_.endo_simul : some variables which could not be negative (e.g consumption, investment etc) are negative in oo_.endo_simul . does this mean something wrong?!
And a general (stupid) question: what is the relation between data in oo_.endo_simul and oo_.irfs, does dynare use one of them to calculate another one?
Thank you in advance,

  1. See
  1. oo_.endo_simul contains a simulation with shocks happening every single period. oo_.irfs is the response after a one-time shock.