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[modules/adao.git] / doc / en / ref_algorithm_EnsembleBlue.rst
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2    Copyright (C) 2008-2023 EDF R&D
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22    Author: Jean-Philippe Argaud, jean-philippe.argaud@edf.fr, EDF R&D
23
24 .. index:: single: EnsembleBlue
25 .. _section_ref_algorithm_EnsembleBlue:
26
27 Calculation algorithm "*EnsembleBlue*"
28 --------------------------------------
29
30 .. ------------------------------------ ..
31 .. include:: snippets/Header2Algo01.rst
32
33 This algorithm realizes a BLUE (Best Linear Unbiased Estimator, which is here an
34 Aitken estimator) type estimation of the state of a system by an ensemble
35 method. To work, one must give a set of backgrounds, their number determining
36 the size of the ensemble for the estimation.
37
38 It is theoretically reserved for observation operator cases which are linear,
39 but has to work also in "slightly" non-linear cases. One can verify the
40 linearity of the observation operator with the help of the
41 :ref:`section_ref_algorithm_LinearityTest`.
42
43 .. ------------------------------------ ..
44 .. include:: snippets/Header2Algo02.rst
45
46 .. include:: snippets/Background.rst
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48 .. include:: snippets/BackgroundError.rst
49
50 .. include:: snippets/Observation.rst
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52 .. include:: snippets/ObservationError.rst
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54 .. include:: snippets/ObservationOperator.rst
55
56 .. ------------------------------------ ..
57 .. include:: snippets/Header2Algo03AdOp.rst
58
59 .. include:: snippets/SetSeed.rst
60
61 StoreSupplementaryCalculations
62   .. index:: single: StoreSupplementaryCalculations
63
64   *List of names*. This list indicates the names of the supplementary
65   variables, that can be available during or at the end of the algorithm, if
66   they are initially required by the user. Their avalability involves,
67   potentially, costly calculations or memory consumptions. The default is then
68   a void list, none of these variables being calculated and stored by default
69   (excepted the unconditionnal variables). The possible names are in the
70   following list (the detailed description of each named variable is given in
71   the following part of this specific algorithmic documentation, in the
72   sub-section "*Information and variables available at the end of the
73   algorithm*"): [
74   "Analysis",
75   "CurrentOptimum",
76   "CurrentState",
77   "Innovation",
78   "SimulatedObservationAtBackground",
79   "SimulatedObservationAtCurrentState",
80   "SimulatedObservationAtOptimum",
81   ].
82
83   Example :
84   ``{"StoreSupplementaryCalculations":["CurrentState", "Residu"]}``
85
86 .. ------------------------------------ ..
87 .. include:: snippets/Header2Algo04.rst
88
89 .. include:: snippets/Analysis.rst
90
91 .. include:: snippets/CurrentState.rst
92
93 .. include:: snippets/Innovation.rst
94
95 .. ------------------------------------ ..
96 .. include:: snippets/Header2Algo05.rst
97
98 .. include:: snippets/Analysis.rst
99
100 .. include:: snippets/CurrentOptimum.rst
101
102 .. include:: snippets/CurrentState.rst
103
104 .. include:: snippets/Innovation.rst
105
106 .. include:: snippets/SimulatedObservationAtBackground.rst
107
108 .. include:: snippets/SimulatedObservationAtCurrentState.rst
109
110 .. include:: snippets/SimulatedObservationAtOptimum.rst
111
112 .. ------------------------------------ ..
113 .. _section_ref_algorithm_EnsembleBlue_examples:
114 .. include:: snippets/Header2Algo06.rst
115
116 - :ref:`section_ref_algorithm_Blue`
117 - :ref:`section_ref_algorithm_EnsembleKalmanFilter`