psb_scatter — Scatter Global Dense Matrix

These subroutines scatters the portions of global dense matrix owned by a process to all the processes in the processes grid.

loc-xi ← scatter(glob-x)

where:

Table 20: Data types

call psb_scatter(glob_x, loc_x, desc_a, info, root, mold)

Type:: Synchronous.
On Entry
glob_x: The array that must be scattered into local pieces.
Scope: global
Type: required
Intent: in.
Specified as: a rank one or two array.
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 have a copy of the global vector.
Scope: global
Type: optional
Intent: in.
Specified as: an integer variable -1 ≤ root ≤ np - 1, default psb_root_, i.e. process 0.
mold: The desired dynamic type for the internal vector storage.
Scope: local.
Type: optional.
Intent: in.
Specified as: an object of a class derived from psb_T_base_vect_type; this is only allowed when loc_x is of type psb_T_vect_type.
On Return
loc_x: the local portion of global dense matrix glob_x.
Scope: local
Type: required
Intent: out.
Specified as: a rank one or two ALLOCATABLE array or an object of type psb_T_vect_type containing numbers of the type indicated in Table 20.
info: Error code.
Scope: local
Type: required
Intent: out.
An integer value; 0 means no error has been detected.