psb_normi -- Infinity Norm of Sparse Matrix

This function computes the infinity-norm of a matrix $A$:

$$nrmi \leftarrow \Vert A\Vert _\infty$$

where:

$A$

represents the global matrix $A$

Table 11: Data types

$A$	Function
Short Precision Real	psb_spnrmi
Long Precision Real	psb_spnrmi
Short Precision Complex	psb_spnrmi
Long Precision Complex	psb_spnrmi

psb_spnrmi(A, desc_a, info)
psb_normi(A, desc_a, info)

Type:

Synchronous.

On Entry

a

the local portion of the global sparse matrix $A$.
Scope: local
Type: required
Intent: in.
Specified as: an object of type spdatapsb_Tspmat_type.

desc_a

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

On Return

Function value

is the infinity-norm of sparse submatrix $A$.
Scope: global
Specified as: a long precision real number.

info

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