PDAF_gather_dim_obs_f

This page documents the routine PDAF_gather_dim_obs_f of PDAF, which was introduced with PDAF V1.13.

In the local filters (LESKTF, LETKF, LSEIK, LNETF) this routine gathers the total observation dimension from process-local observation dimensions and returns this dimension.

The routine has to be called once before using any of the routines PDAF_gather_obs_f or PDAF_gather_obs_f2. This is because it stores the information on the process-local observation dimensions to enable the gathering operations in the two other routines.

The routine is typically used in the routine init_dim_obs_f if the analysis step of the local filters is parallelized.

The interface is the following:

  SUBROUTINE PDAF_gather_dim_obs_f(dim_obs_p, dim_obs_f)

with the following arguments:

• dim_obs_p : integer, intent(in)
  Process-local dimension of state vector
• dim_obs_f : integer, intent(out)
  Full dimension of state vector

Notes:

• It is allowed to compute PDAF_gather_dim_obs_f multiple times. However, the calls to PDAF_gather_obs_f and PDAF_gather_obs_f2 will use the dimensions defined in the most recent call to PDAF_gather_dim_obs_f