manual: updated info on auxiliary variables
Related to https://git.dynare.org/Dynare/dynare/-/issues/1811pac-components
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@ -1299,11 +1299,14 @@ the form ``MULT_i``, where *i* represents the constraint with which
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the multiplier is associated (counted from the order of declaration in
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the multiplier is associated (counted from the order of declaration in
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the model block).
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the model block).
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The last type of auxiliary variables is introduced by the
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Auxiliary variables are also introduced by the
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``differentiate_forward_vars`` option of the model block. The new
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``differentiate_forward_vars`` option of the model block. The new
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variables take the form ``AUX_DIFF_FWRD_i``, and are equal to
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variables take the form ``AUX_DIFF_FWRD_i``, and are equal to
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``x-x(-1)`` for some endogenous variable ``x``.
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``x-x(-1)`` for some endogenous variable ``x``.
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Finally, auxiliary variables will arise in the context of employing the
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``diff``-operator.
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Once created, all auxiliary variables are included in the set of
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Once created, all auxiliary variables are included in the set of
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endogenous variables. The output of decision rules (see below) is such
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endogenous variables. The output of decision rules (see below) is such
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that auxiliary variable names are replaced by the original variables
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that auxiliary variable names are replaced by the original variables
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@ -1314,7 +1317,7 @@ variables is stored in ``M_.orig_endo_nbr``, and the number of
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endogenous variables after the creation of auxiliary variables is
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endogenous variables after the creation of auxiliary variables is
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stored in ``M_.endo_nbr``.
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stored in ``M_.endo_nbr``.
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See `<https://archives.dynare.org/DynareWiki/AuxiliaryVariables>`__ for more technical details on auxiliary variables.
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See `<https://git.dynare.org/Dynare/dynare/-/wikis/Auxiliary-variables>`__ for more technical details on auxiliary variables.
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.. _init-term-cond:
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.. _init-term-cond:
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