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#### 5.3 psb_gather — Gather Global Dense Matrix

These subroutines collect the portions of global dense matrix distributed over all process into one single array stored on one process.

where:

glob_x
  is the global submatrix glob_x1:m,1:n
loc_xi
  is the local portion of global dense matrix on process i.
collect
  is the collect function.

xi,y | Subroutine
Integer | psb_gather
Short Precision Real | psb_gather
Long Precision Real | psb_gather
Short Precision Complex | psb_gather
Long Precision Complex | psb_gather

Table 19: Data types

call psb_gather(glob_x, loc_x, desc_a, info, root)
call psb_gather(glob_x, loc_x, desc_a, info, root)

Type:
  Synchronous.
On Entry
loc_x
  the local portion of global dense matrix glob_x.
  Scope: local
  Type: required
  Intent: in.
  Specified as: a rank one or two array or an object of type psb_T_vect_type indicated in Table 19.
desc_a
  contains data structures for communications.
  Scope: local
  Type: required
  Intent: in.
  Specified as: a structured data of type psb_desc_type.
root
  The process that holds the global copy. If root = -1 all the processes will have a copy of the global vector.
  Scope: global
  Type: optional
  Intent: in.
  Specified as: an integer variable -1 ≤ root ≤ np - 1, default -1.
On Return
glob_x
  The array where the local parts must be gathered.
  Scope: global
  Type: required
  Intent: out.
  Specified as: a rank one or two array with the ALLOCATABLE attribute.
info
  Error code.
  Scope: local
  Type: required
  Intent: out.
  An integer value; 0 means no error has been detected.

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