= PDAF_iau_set_pointer = 

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

With this routine the user can set a pointer to the PDAF-internal array of ensemble increments. This gives direct access to the increment array e.g. to analyze it or to write it into a file for restarting. 

The routine can be called by each single process, but it only provides a pointer to the process-local part of the increment array. For domain-decomposed models, this array only includes the state vector part for the process domain. In addition, it usually only contains a sub-ensemble unless one uses the flexible parallelization mode with a single model task. For the fully parallel mode, the process(es) of a single model task only hold a single ensemble state.

The interface is:
{{{
  SUBROUTINE PDAF_iau_set_pointer(iau_ptr, flag)

    REAL, POINTER, INTENT(out) :: iau_ptr(:,:)  ! Pointer to IAU ensemble array
    INTEGER, INTENT(out)       :: flag          ! Status flag
}}}

Hints:
 * In Fortran user code one has to declare[[BR]]`REAL, POINTER :: iau_ptr(:,:) `[[BR]] and provide this as the first argument. One does not need to allocate this pointer.