= PDAFomi_diag_dimobs = 

This page documents the routine `PDAFomi_diag_dimobs` of PDAF, which was introduced with PDAF V3.0. This is part of the [wiki:PDAFomi_observation_diagnostics PDAF-OMI observation diagnostics module]. 

The routine returns a pointer to a vector of the number of observations (observation dimension) for each active observation type.

Usually all PDAFomi_diag routines are called in `prepoststep_pdaf` where the observation information can be retrieved and analyzed.

The interface is: 
{{{
  SUBROUTINE PDAFomi_diag_dimobs(dim_obs_ptr)

    INTEGER, POINTER, INTENT(inout) :: dim_obs_ptr(:)   ! Pointer to observation dimensions
}}}

**Note:**
 * In Fortran user code the pointer should be declared in the form[[BR]] `INTEGER, POINTER :: dim_obs_ptr(:)`[[BR]] It does not need to be allocated
 * If the observation diagnostics have not be activated by using [wiki:PDAFomi_set_obs_diag]. the pointer array will have length 1 and the observation dimension is returned as 0