This commit only introduce new elements in the Dynare language (adding the
possibility to decompose the target into stationary and non stationary
components) and insure that all the former codes (ie without decomposition of
the target) are still working as expected.
- Can handle more than one equation.
- Can handle identities.
- Forbids dynamic equations.
- Can handle following LHS y, diff(y), diff(diff(y)), log(y), diff(log(y)) and
diff(diff(log(y))), other transformations will result in an error.
- Added integration tests.
Remark 1. In the integration tests I compare the values returned by the
evaluate routine with the values computed with the simulation
routines. Normally the discrepancies should be small, but this is not
the case when the endogenous variable appear under a log on the
LHS. My current conclusion is that this has more to do with the
cumulation of the accuracy errors in the simulation routine (a
sequence of Newton algorithms) rather than with the evaluate routine.
Remark 2. Currently the only allowed nonlinear transformation on the LHS
endogenous variable is the log. It is not difficult to generalise, at
some point I had all the matlab functions allowed by Dynare,
but this would complicate the code for not much gain.
Stéphane Adjemian (Charybdis)
Sébastien Villemot
Stéphane Adjemian (Charybdis)
Stéphane Adjemian (Charybdis)