psb_geaxpby -- General Dense Matrix Sum

This subroutine is an interface to the computational kernel for dense matrix sum:

$$y \leftarrow \alpha\> x+ \beta y$$

call psb_geaxpby(alpha, x, beta, y, desc_a, info)

Table 1: Data types

$x$, $y$, $\alpha$, $\beta$	Subroutine
Short Precision Real	psb_geaxpby
Long Precision Real	psb_geaxpby
Short Precision Complex	psb_geaxpby
Long Precision Complex	psb_geaxpby

Type:

Synchronous.

On Entry

alpha

the scalar $\alpha$.
Scope: global
Type: required
Intent: in.
Specified as: a number of the data type indicated in Table 1.

x

the local portion of global dense matrix $x$.
Scope: local
Type: required
Intent: in.
Specified as: a rank one or two array containing numbers of type specified in Table 1. The rank of $x$ must be the same of $y$.

beta

the scalar $\beta$.
Scope: global
Type: required
Intent: in.
Specified as: a number of the data type indicated in Table 1.

y

the local portion of the global dense matrix $y$.
Scope: local
Type: required
Intent: inout.
Specified as: a rank one or two array containing numbers of the type indicated in Table 1. The rank of $y$ must be the same of $x$.

desc_a

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

On Return

y

the local portion of result submatrix $y$.
Scope: local
Type: required
Intent: inout.
Specified as: a rank one or two array containing numbers of the type indicated in Table 1.

info

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