Plotting of IRFs without running model

Dynare help (legacy posts)
8

First of all: even if the parameters you change do not affect steady states, they will alter the decision rules and require solving the model again.

What exactly are you trying to do? If we are talking about IRFs from different mod-files, the answer is here: [Q: combining IRFs into subplotted figures & iterating?). See also [Multiple Shocks and Multiple Plots (2 Questions))
If you just want to change a parameter within a mod-file and then generate the IRFs, do

stoch_simul(irf=x,order=x);
irf_set1=oo_.irfs;
set_param_value('betta',x)
stoch_simul(irf=x,order=x);
irf_set2=oo_.irfs;

and then plot the results directly from the structures. With the set_param_value you can change values of parameters (for standard deviations, use a new shocks-block with the reset option).

For multiple shocks: due to certainty equivalence at first order the IRFs to simultaneous shocks are just the sum of individual IRFs. At higher order, you need to use the simult_ function, see github.com/JohannesPfeifer/DSGE_mod/tree/master/RBC_news_shock_model

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