psb_geinv -- Entrywise Inversion

This function computes the entrywise inverse of a vector $x$ and puts it into $y$

$$/ \leftarrow 1/x(i).$$

psb_geinv(x, y, desc_a, info, [flag)

Table 16: Data types

$/$, $x$, $y$	Function
Short Precision Real	psb_geinv
Long Precision Real	psb_geinv
Short Precision Complex	psb_geinv
Long Precision Complex	psb_geinv

Type:

Synchronous.

On Entry

x

the local portion of global dense vector $x$.
Scope: local
Type: required
Intent: in.
Specified as: an object of type vdatapsb_T_vect_type containing numbers of type specified in Table 2.

desc_a

contains data structures for communications.
Scope: local
Type: required
Intent: in.
Specified as: an object of type descdatapsb_desc_type.

flag

check if any of the $x(i) = 0$, and in case returns error halting the computation.
Scope: local
Type: optional Intent: in.
Specified as: the logical value flag=.true.

On Return

y

the local portion of result submatrix $x$.
Scope: local
Type: required
Intent: out.
Specified as: an object of type vdatapsb_T_vect_type containing numbers of the type indicated in Table 16.

info

Error code.
Scope: local
Type: required
Intent: out.
An integer value; 0 means no error has been detected.