list of reserved variable names

[ian_db]

I was running into a problem with a model recently and finally figured out that it was because I had a variable named g1, which was causing problems when dynare tried to calculate the jacobian to get the steady state (i.e. in the XX_static.m file for XX.mod). Is there a list of variable names like this that I need to avoid? Obviously I'm not using names like ln, inf, exp, etc., but g1 isn't really something I could have foreseen.

[MichelJuillard]

This should not happen. Can you please send us the example.

Best

Michel

[ian_db]

Sorry, forgot all about this. can't recall the exact code. I'm pretty sure that the problem appeared when using a # variable. I just ran into the same problem when I defined a #y term. It didn't like that, but when I renamed it #yz everything was fine.

Here's some code that generates the problem for y. If you replace #y with #g you get a similar error.

Code: Select all

var pi,k,ik,l;
varexo eps_x;

parameters rfb,z,s2x,s2gam,sxgam,phi_gam,phi_g,dep,alpha,rho,w,kappa,s2g,s2i,eta;

rfb=.01;
z=0;
s2x=.01;
s2gam=0;
sxgam=0*sqrt(s2gam*sxgam);
phi_gam=0;
phi_g=0.9;
s2g=0.0;
s2i=0.0;
dep=.025;
alpha=.95;
rho=0.5;
w=1;
kappa=0;
eta=.5;


model;

// demand growth

// capital update
exp(k-k(-1) + eps_x) = (1-dep) + ik;

// Output
# y = log((alpha*exp(((rho-1)/rho)*k(-1)) + (1-alpha)*exp(((rho-1)/rho)*l))^(rho/(rho-1)));
# y1 = log((alpha*exp(((rho-1)/rho)*k) + (1-alpha)*exp(((rho-1)/rho)*l(+1)))^(rho/(rho-1)));

// labor demand
w = (1-alpha)*eta*exp((1-eta)*(eps_x-y))*exp((y-l)/rho);

// capital euler equation
1+kappa*ik = exp(-rfb)*(alpha*eta*exp((1-eta)*(eps_x-y1))*exp((y1-k)/rho)
                                +(kappa/2)*(ik(+1)^2)
                                +(1-dep)*(1+kappa*ik(+1)));
                               
// profit function
exp(pi) = exp(eta*y + (1-eta)*(eps_x)) - w*exp(l)-exp(k(-1))*(ik+kappa*(ik^2)/2);

end;

shocks;
var eps_x; stderr s2x;

end;

initval;
k=3.8;
ik=dep;
l=-.8;
pi=-.7-ik*exp(k);

end;

steady;
check;

stoch_simul(periods=1000,order=1,ar=0,IRF=0,simul_seed=1);


[SébastienVillemot]

You're right, there is a name conflict when a model local variable (i.e. a variable declared with a #) is called g1, or g2.

This problem will be fixed in the next release of Dynare.

Best,