Hello everyone!
Please, I need some help. I would like to perform identical and consecutive unanticipated monetary policy shocks, but I am not sure how to implement it. For example, in a zero steady state environment, the monetary authority set the interest rate igual to 2% annualized for 4 period consecutive, after 4 stochastic shocks not anticipated by the agents.

I believe that my question is the same that the topic below:

Dear Pfeifer.
I am using a linear Gali and Monacelli model-based with a different phillips curve.Hence, I would like to asses the impact of a 3 period forward guidance shock in comparison to an unanticipated 3 period stochastic shock.
Is it possible?

Ok! Thanks.
So, in order to implement a Forward Guidance shocks, I have to use:

Nominal_Interest = rhor*(Nominal_Interest(-1)-Nominal_Interestnat(-1)) + (1-rhor)*(rpi*Inflation_H + ry*(gap_gdp)) + Nominal_Interestnat + e_r_news; (taylor rule)
e_r_news= e0+e1(-1)+e2(-2);
shock_matrix = zeros(options_.irf,M_.exo_nbr); %create shock matrix with number of time periods in columns
// set z to 1 for three periods via news shocks
shock_matrix = zeros(options_.irf,M_.exo_nbr);
shock_matrix(1,strmatch('e0',M_.exo_names,'exact')) = 1;
shock_matrix(1,strmatch('e1',M_.exo_names,'exact')) = 1;
shock_matrix(1,strmatch('e2',M_.exo_names,'exact')) = 1;

?

And when it comes to 3 periods unanticipated shocks with same size?

shock_matrix = zeros(options_.irf,M_.exo_nbr); %create shock matrix with number of time periods in columns
shock_matrix = zeros(options_.irf,M_.exo_nbr);
shock_matrix(1,strmatch('e0',M_.exo_names,'exact')) = 1;
shock_matrix(2,strmatch('e0',M_.exo_names,'exact')) = 1;
shock_matrix(3,strmatch('e0',M_.exo_names,'exact')) = 1;