= PDAF_iau_set_weights = 

This page documents the routine `PDAF_iau_set_weights` of PDAF, which was introduced with PDAF V3.0.

This routine allows the user to provide a user-specified vector of increment weights. While `PDAF_iau_init` allows to choose among pre-defined weight functions, one might like to use a different function and the corresponding weight can be set here.

The routine has to be called by all processes that are model processes. A common place is to call the routine in `assimilate_pdaf` after an analysis step or in `distribute_state_pdaf`.


The interface is the following:
{{{
  SUBROUTINE PDAF_iau_set_weights(iweights, weights)

    INTEGER, INTENT(in) :: iweights        ! Length of weights input vector
    REAL, INTENT(in) :: weights(iweights)  ! Input weight vector
}}}

Hints:
 * If `iweights` is different from the number of IAU steps set in `PDAF_iau_init` or `PDAF_iau_reset` only the minimum of `iweights` and the set IAU steps is filled with the provided weights vector.
 * We recommend to only change the weights vector before a forecast phase.
 * While setting different weight functions for different processes or model tasks is possible this likely leads to inconsistencies.