Limited output in Matlab/Dynare?

[Nicole]

Hi everyone,

I hope you're able to help me with something. I've 'succesfully' ran my .mod file in Dynare, and all seems well (or at least I get the right steady state values I was looking for!). However, I only get the steady state values. No other correlations, info, whatsoever that you regularly see. I was wondering why this is? I think it might have something to do with the fact that my model is very limited (having only two equations and two variables).

However, I was looking to graph the output ranging over the periods from -4 to 8, with 0 being the moment that the shock (interest rate i increasing from 0 to 1) occurs. I want to see the gradual increase of pi and initial decline and following increase of x - but I don't get that output anywhere. Also looking at the oo_ 'output/thing' (sorry, don't know how to call that exactly) there are only two values and those are of the steady state, being x = 0.15 and pi = 1. When I put this into a graph it's obviously only a 0.15 or a 1, while I want to see the movement of these variables over time.

Thank you very much in advance!

Nicole

[jpfeifer]

Your model seems to be perfect foresight, i.e. deterministic. You have the full setup, but did not tell Dynare to compute anything (simul or sequence of perfect_foresight_setup and perfect_foresight_solver). Given that you start in steady state, end there, and have no shocks, not much is going to happen. Note that you can use for example

Code: Select all

rplot x;

to plot the variable x after perfect foresight simulations.

[Nicole]

Thank you very much for your help!

My model is indeed deterministic. I've tried the rplot command and I got indeed a graph with a depiction of what was happening with my variables. Still only two values (0 and 1 or 0 and .15) in my oo_ output though. I've tried using the perfect_foresight_setup command and looked it up in the manual but I get an error. How would one use that command correctly? I did add

simul (periods=200,stack_solve_algo=0);

to my .mod file now, but still no luck. What I'm looking for are more 'in between' values. Would this have something to do with the fact that variable i jumps up to 1 from period 0 to 1 and hence all other variables also respond directly, i.e. that there are no real "in between" values since the jumps are that large?

Thank you in advance.

[Nicole]

I think I fixed it! I changed the amount of periods from 200 to 3 to see what happend and it indeed showed a lot more detail. What would the perfect_foresight_setup or perfect_foresight solver command do?

[jpfeifer]

The combination of perfect_foresight_setup and perfect_foresight is equivalent to calling simul.