# How to use set\_param\_value
**URL:** https://forum.dynare.org/t/how-to-use-set-param-value/20448
**Category:** Stochastic simulations
**Created:** [29 May 2022 14:44 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448 "2022-05-29T14:44:08Z")
**Posts on this page:** 15
**Page:** 1
### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [29 May 2022 14:44 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/1 "2022-05-29T14:44:09Z")
Hi guys, I met some problem when trying to loop over a parameter by command ‘set\_param\_value’.
I want to set the param ‘Phi\_Pi\_star = 1.2’, and here’s how I did:
set\_param\_value(‘Phi\_Pi\_star’,1.2);
dynare baseline noclearall;
But I found the value of Phi\_Pi\_star would be covered by calibrate mod file. Then I deleted the ‘Phi\_Pi = x;’ from the calibrate mod file and did it again, but this time the steady state got NaN (I used a log-linearize model, and pretty sure the problem is not from the model).
I check the “Looping over Parameters”, but still have no idea what I done wrong.
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### Author:  [@punnoosejacob](https://forum.dynare.org/u/punnoosejacob)
#### Post date: [29 May 2022 20:19 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/2 "2022-05-29T20:19:36Z")
I use the set\_param\_value function within the dynare mod file, and it works fine. I don’t think we can use that function outside the mod file as you have. Dynare would simply overwrite it: somebody please correct me if I am wrong.
Cheers
Reuben
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [30 May 2022 09:06 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/3 "2022-05-30T09:06:36Z")
@punnoosejacob Is correct. `set_param_value` will rely on a global variable that will not yet exists before calling Dynare the first time. Also you may overwrite the contents.
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 10:06 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/4 "2022-05-30T10:06:51Z")
Thanks a lot, it helps!
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 10:12 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/5 "2022-05-30T10:12:55Z")
I have tried another way by using ‘set\_param\_value’ inside the mod file, it works well!
Moreover I wondering if I can use stoch\_simul in a matlab file after calling dynare once? (I have seen your comments in another discussion, but I still couldn’t figure out the routine).
And I do know Dynare can compute the SpectralDensity, if it is possible way to compute the cross-spectral density?
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [30 May 2022 13:13 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/6 "2022-05-30T13:13:51Z")
An example is at [Parameter loop in Dynare 5.x - #3 by jpfeifer](https://forum.dynare.org/t/parameter-loop-in-dynare-5-x/20293/3)
And no, the cross-spectra are not computed by Dynare.
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 14:36 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/7 "2022-05-30T14:36:11Z")
Thanks!
If there’s any precedents on calculating cross-spectral density or maybe some advice?
And if there’s possible way to get the coefficient matrix of the linear equation system like Sims(2002)/Klein/B&K suggest to?
I am trying to replicate the method of Sargent and Surico (2011, AER) and Kliem et al(2016,EER) by Dynare.
Great thanks for answering so many question!
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 15:35 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/8 "2022-05-30T15:35:07Z")
As for
"
And if there’s possible way to get the coefficient matrix of the linear equation system like Sims(2002)/Klein/B&K suggest to?
"
It that the “oo\_.dr.ghx”?
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [30 May 2022 15:40 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/9 "2022-05-30T15:40:32Z")
Which linear equation system do you mean? The state space representation?
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 15:45 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/10 "2022-05-30T15:45:03Z")
Yes
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 15:47 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/11 "2022-05-30T15:47:03Z")
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### Author:  [@jpfeifer](https://forum.dynare.org/u/jpfeifer)
#### Post date: [30 May 2022 15:53 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/12 "2022-05-30T15:53:38Z")
Have a look at [DSGE\_mod/ABCD\_test.m at master · JohannesPfeifer/DSGE\_mod · GitHub](https://github.com/JohannesPfeifer/DSGE_mod/blob/master/FV_et_al_2007/ABCD_test.m)
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 15:57 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/13 "2022-05-30T15:57:52Z")
Many thanks in advance!
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 16:08 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/14 "2022-05-30T16:08:57Z")
Is control toolbox means the control system toolbox?
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### Author:  [@Nakatuma](https://forum.dynare.org/u/Nakatuma)
#### Post date: [30 May 2022 16:10 UTC](https://forum.dynare.org/t/how-to-use-set-param-value/20448/15 "2022-05-30T16:10:24Z")
problem solved, thanks a lot