52 lines
1.1 KiB
Modula-2
52 lines
1.1 KiB
Modula-2
var y_backward;
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parameters rho_1 rho_2;
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rho_1=0.2;
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rho_2=0.1;
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// Equilibrium conditions
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model;
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y_backward=rho_1*y_backward(-1)+rho_2*y_backward(-2);
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end;
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// Set starting value for solver
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initval;
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y_backward=1;
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end;
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steady;
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// Set initial conditions for state variables
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histval;
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y_backward(0)=1;
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y_backward(-1)=2;
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end;
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// Check the Blanchard-Kahn conditions
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check;
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// Deterministic simulation of the model for 200 periods
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perfect_foresight_setup(periods=100);
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perfect_foresight_solver(tolf=1e-12);
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if ~oo_.deterministic_simulation.status
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error('Perfect foresight simulation failed')
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end
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// Display the path of consumption and capital
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rplot y_backward;
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junk=zeros(1,options_.periods+M_.maximum_lag);
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junk(1)=2;
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junk(2)=1;
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for ii=3:options_.periods+2
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junk(ii)=M_.params(strmatch('rho_1',M_.param_names,'exact'))*junk(ii-1)+M_.params(strmatch('rho_2',M_.param_names,'exact'))*junk(ii-2);
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end
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if max(abs(junk(M_.maximum_lag+1:end)-oo_.endo_simul(strmatch('y_backward',M_.endo_names,'exact'),:)))>1e-10
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error('Solution of purely backwards model not correct')
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end
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