apply — Preconditioner application routine

call prec%apply(x,y,desc_a,info,trans,work)
call prec%apply(x,desc_a,info,trans)

Type:: Synchronous.
On Entry
prec: the preconditioner. Scope: local
Type: required
Intent: in.
Specified as: a preconditioner data structure psb_prec_type.
x: the source vector. Scope: local
Type: required
Intent: inout.
Specified as: a rank one array or an object of type psb_T_vect_type.
desc_a: the problem communication descriptor. Scope: local
Type: required
Intent: in.
Specified as: a communication data structure psb_desc_type.
trans: Scope:
Type: optional
Intent: in.
Specified as: a character.
work: an optional work space Scope: local
Type: optional
Intent: inout.
Specified as: a double precision array.

On Return
y: the destination vector. Scope: local
Type: required
Intent: inout.
Specified as: a rank one array or an object of type psb_T_vect_type.
info: Error code.
Scope: local
Type: required
Intent: out.
An integer value; 0 means no error has been detected.