# Some questions with deterministic simulation **URL:** \ **Category:** Stochastic simulations\ **Created:** [13 December 2020 07:47 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123 "2020-12-13T07:47:42Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [13 December 2020 07:47 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/1 "2020-12-13T07:47:43Z")
Dear Sir, I use dynare 4.5.7 to simulat，I want to simulate in a deterministic model，but the results are very strange.The simulated trajectory map of consumption and capital stock is two straight lines， I wonder why there is no dynamics, many thanks! [simulation.mod](https://forum.dynare.org/uploads/short-url/2RAfKDL2LsdpWx7h7madolEiN6m.mod) (2.9 KB) ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [13 December 2020 09:08 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/2 "2020-12-13T09:08:51Z")
I get the message: > Failed to solve perfect foresight model That should explain the output. You are getting returned the starting values. Try 4.6.3 with ```auto simul (periods = 200,robust_lin_solve); ``` ---
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [14 December 2020 01:51 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/3 "2020-12-14T01:51:34Z")
Thank you, dear professor with this method, my problem has been solved, you are the benchmark of my study！ 😀 ---
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [29 December 2020 08:25 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/4 "2020-12-29T08:25:15Z")
Dear Dr.feifer,I am doing deterministic simulation experiments with different shocks recently, but MATLAB there are errors in the running process, I do not know how to solve these errors, please guide ![simulation.mod|attachment](https://forum.dynare.org/uploads/default/original/2X/0/0998658554595997a94ecbed82ce8a4cb6d644c0.mod) (3.0 KB) ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [29 December 2020 12:42 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/5 "2020-12-29T12:42:31Z")
Your attachment is broken. ---
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [30 December 2020 00:43 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/6 "2020-12-30T00:43:10Z")
[simulation.mod](https://forum.dynare.org/uploads/short-url/AmzfwcrEt5qRw1MiWG1FGM9V8pT.mod) (3.0 KB) Uploading: simulation.mod… I have re-uploaded model file[simulation.mod](https://forum.dynare.org/uploads/short-url/AmzfwcrEt5qRw1MiWG1FGM9V8pT.mod) (3.0 KB) ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [30 December 2020 09:06 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/7 "2020-12-30T09:06:44Z")
Are you sure your shock size is correct? Shouldn’t the shocks be smaller by a factor of 100? In nonlinear models that matters. ---
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [30 December 2020 09:15 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/8 "2020-12-30T09:15:33Z")
My two shocks are labor shock and money supply shock respectively. Do you mean to set both shocks to less than one？ ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [30 December 2020 09:19 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/9 "2020-12-30T09:19:28Z")
What I am saying is that if your model variables are in logs and therefore in percent, then specifying ```auto shocks; var em0; periods 2:6; values 1.8; end; ``` for ```auto m0-log(m0s)=rhom0*(m0(-1)-log(m0s))+em0; %m0冲击 ``` implies that each period there is 1.8=180% shock happening. If you want 1.8%, then use `0.018`. Also check whether you want `m0` to be above steady state by this value or whether you want to shock it every period by this value. In the latter case, the deviations will accumulate massively. ---
**Author:** ![chenxin](https://forum.dynare.org/letter_avatar_proxy/v4/letter/c/ee59a6/32.png) [@chenxin](https://forum.dynare.org/u/chenxin)\ **Post date:** [30 December 2020 09:21 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/10 "2020-12-30T09:21:53Z")
Okay, prof. feifer, I see what you mean ---
**Author:** ![jpfeifer](https://forum.dynare.org/user_avatar/forum.dynare.org/jpfeifer/32/5044_2.png) [@jpfeifer](https://forum.dynare.org/u/jpfeifer)\ **Post date:** [5 January 2021 07:40 UTC](https://forum.dynare.org/t/some-questions-with-deterministic-simulation/17123/12 "2021-01-05T07:40:08Z")
They are not the same. Do ```auto rplot m ; rplot l; rplot m0; ``` to see that the second simply causes tiny movements that are dwarfed by the other shock.