Manual: add a short description of how decision rules are stored at order ≥ 4
Closes: #1764time-shift
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@ -4503,6 +4503,20 @@ The coefficients of the decision rules are stored as follows:
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unfolded :math:`G_3` matrix, they must be multiplied by 3 when
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unfolded :math:`G_3` matrix, they must be multiplied by 3 when
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computing the decision rules.
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computing the decision rules.
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Higher-order approximation
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--------------------------
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Higher-order approximations are simply a generalization of what is done at
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order 3.
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The steady state is stored in ``oo_.dr.ys`` and the constant correction is
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stored in ``oo_.dr.g_0``. The coefficient for orders 1, 2, 3, 4… are
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respectively stored in ``oo_.dr.g_0``, ``oo_.dr.g_1``, ``oo_.dr.g_2``,
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``oo_.dr.g_3``, ``oo_.dr.g_4``… The columns of those matrices correspond to
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multidimensional indices of state variables, in such a way that symmetric
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elements are never repeated (for more details, see the description of
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``oo_.dr.g_3`` in the third-order case).
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.. _estim:
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.. _estim:
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