= PDAF_put_state_lestkf = This page documents the routine `PDAF_put_state_lestkf` of PDAF. The routine is typically called in `assimilate_pdaf` or directly in the model code. The routines `PDAF_put_state_*` are used with the 'flexible' implementation variant of PDAF. The general aspects of the filter specific routines `PDAF_put_state_*` are described on the page [ModifyModelforEnsembleIntegration Modification of the model code for the ensemble integration] and its sub-page on [InsertAnalysisStep inserting the analysis step]. For the 'fully parallel' implementation variant the alternative routines `PDAF_assimilate_*` are used. The interface when using the LESTKF is the following: {{{ SUBROUTINE PDAF_put_state_lestkf(U_collect_state, U_init_dim_obs_f, U_obs_op_f, U_init_obs_f, & U_init_obs_l, U_prepoststep, U_prodRinvA_l, U_init_n_domains, & U_init_dim_l, U_init_dim_obs_l, & U_g2l_state, U_l2g_state, U_g2l_obs, & U_init_obsvar, U_init_obsvar_l, status_pdaf) }}} with the following arguments: * `U_collect_state`: The name of the user-supplied routine that initializes a state vector from the array holding the ensemble of model states from the model fields. This is basically the inverse operation to `U_distribute_state` used in [ModifyModelforEnsembleIntegration#PDAF_get_state PDAF_get_state]. * `U_init_dim_obs_f`: The name of the user-supplied routine that provides the size of the full observation vector * `U_obs_op_f`: The name of the user-supplied routine that acts as the full observation operator on some state vector * `U_init_obs_f`: The name of the user-supplied routine that initializes the full vector of observations * `U_init_obs_l`: The name of the user-supplied routine that initializes the vector of observations for a local analysis domain * `U_prepoststep`: The name of the pre/poststep routine as in `PDAF_get_state` * `U_prodRinvA_l`: The name of the user-supplied routine that computes the product of the inverse of the observation error covariance matrix with some matrix provided to the routine by PDAF. * `U_init_n_domains`: The name of the routine that provides the number of local analysis domains * `U_init_dim_l`: The name of the routine that provides the state dimension for a local analysis domain * `U_init_dim_obs_l`: The name of the routine that initializes the size of the observation vector for a local analysis domain * `U_g2l_state`: The name of the routine that initializes a local state vector from the global state vector * `U_l2g_state`: The name of the routine that initializes the corresponding part of the global state vector from the the provided local state vector * `U_g2l_obs`: The name of the routine that initializes a local observation vector from a full observation vector * `U_init_obsvar`: The name of the user-supplied routine that provides a global mean observation error variance (This routine will only be executed, if an adaptive forgetting factor is used) * `U_init_obsvar_l`: The name of the user-supplied routine that provides a mean observation error variance for the local analysis domain (This routine will only be executed, if a local adaptive forgetting factor is used) * `status_pdaf`: The integer status flag. It is zero, if `PDAF_put_state_lestkf` is exited without errors. Note: * The order of the routine names does not show the order in which these routines are executed. See the [ImplementAnalysislestkf#Executionorderofuser-suppliedroutines section on the order of the execution] on the page on implementing the analysis step of the LESTKF algorithm. The user-supplied call-back routines are described on the page on [ImplementAnalysislestkf implementing the analysis step of the LESTKF algorithm]. It is recommended that the value of `status_pdaf` is checked in the program after `PDAF_put_state_lestkf` is executed. Only if its value is 0 the initialization was successful. PDAF also has a [PdafSimplifiedInterface Simplified Interface] providing the routine `PDAF_put_state_lestkf_si`. In the simplified interface, the name of the user-supplied routines have predefined names and do not appear in the call to `PDAF_put_state_lestkf_si`. More information on the pre-defined names is provided in the [ImplementAnalysislestkf page on implementing the analysis step of the LESTKF algorithm].