psb_geamaxs -- Generalized Infinity Norm

This subroutine computes a series of infinity norms on the columns of a dense matrix $x$:

$$res(i) \leftarrow \max_k \vert x(k,i)\vert$$

call psb_geamaxs(res, x, desc_a, info)

Table 5: Data types

$res$	$x$	Subroutine
Short Precision Real	Short Precision Real	psb_geamaxs
Long Precision Real	Long Precision Real	psb_geamaxs
Short Precision Real	Short Precision Complex	psb_geamaxs
Long Precision Real	Long Precision Complex	psb_geamaxs

Type:

Synchronous.

On Entry

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 5.

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

res

is the infinity norm of the columns of $x$.
Scope: global
Intent: out.
Specified as: a number or a rank-one array of long precision real numbers.

info

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