# Determinacy/indeterminacy graphs

**URL:** <https://forum.dynare.org/t/determinacy-indeterminacy-graphs/26578>\
**Category:** Stochastic simulations\
**Created:** [15 October 2024 10:44 UTC](https://forum.dynare.org/t/determinacy-indeterminacy-graphs/26578 "2024-10-15T10:44:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Hugo\_15](https://forum.dynare.org/letter_avatar_proxy/v4/letter/h/ecb155/32.png) [@Hugo\_15](https://forum.dynare.org/u/Hugo_15)\
**Post date:** [15 October 2024 10:44 UTC](https://forum.dynare.org/t/determinacy-indeterminacy-graphs/26578/1 "2024-10-15T10:44:51Z")

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Hello everyone,

I have a quick question regarding determinacy/indeterminacy graphs in dynare.

I am running the code below to check where my model is determinate for different values of Delta and phi\_pi. However, it turns out that the graphs that I obtain are different when I calibrate different initial values of Delta and I don’t understand why because my steady-state is invariant on Delta (which is a share of constrained agents in my model). Normally because I do the loop on Delta I should have the same graph no matter what is the initial value no ?  
Can someone understand why I get such a weird thing ? Maybe there is something I am doing wrong in the code.  
Thanks in advance for your reply.

Hugo

phi\_pi\_vec=linspace(0,5,100);  
Delta\_vec=linspace(0,1,100);  
[phi\_pi\_mat,Delta\_mat]=meshgrid(phi\_pi\_vec,Delta\_vec);  
info\_mat=NaN(size(phi\_pi\_mat));  
if isempty(options\_.qz\_criterium)  
options\_.qz\_criterium = 1+1e-6;  
end  
for phi\_pi\_iter=1:length(phi\_pi\_vec)  
for Delta\_iter=1:length(Delta\_vec)  
set\_param\_value(‘phi\_pi’,phi\_pi\_mat(phi\_pi\_iter,Delta\_iter));  
set\_param\_value(‘Delta’,Delta\_mat(phi\_pi\_iter,Delta\_iter));  
[dr,info]=resol(0,M\_,options\_,oo\_);  
info\_mat(phi\_pi\_iter,Delta\_iter)=info(1);  
end  
end  
Z\_plot=zeros(size(info\_mat));  
Z\_plot(info\_mat==0)=1;  
figure(‘Name’,‘The Determinacy Region’)  
contourf(phi\_pi\_mat,Delta\_mat,Z\_plot,1)  
xlabel(‘\phi\_\pi’)  
ylabel(‘\Delta’)

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<div class="post-metadata">

**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:** [15 October 2024 11:21 UTC](https://forum.dynare.org/t/determinacy-indeterminacy-graphs/26578/2 "2024-10-15T11:21:15Z")

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I would need to see the full codes to replicate the issue.

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<div class="post-metadata">

**Author:** ![Hugo\_15](https://forum.dynare.org/letter_avatar_proxy/v4/letter/h/ecb155/32.png) [@Hugo\_15](https://forum.dynare.org/u/Hugo_15)\
**Post date:** [16 October 2024 07:47 UTC](https://forum.dynare.org/t/determinacy-indeterminacy-graphs/26578/3 "2024-10-16T07:47:29Z")

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Dear Professor,

Thanks for your quick reply but I found where was the issue. It cames from the interaction with another parameters.

Have a good day.

Best regards,

Hugo