psb_spnrm1 -- 1-Norm of Sparse Matrix

This function computes the 1-norm of a matrix $A$:

$$nrm1 \leftarrow \Vert A\Vert _1$$

where:

$A$

represents the global matrix $A$

Table 10: Data types

$A$	Function
Short Precision Real	psb_spnrm1
Long Precision Real	psb_spnrm1
Short Precision Complex	psb_spnrm1
Long Precision Complex	psb_spnrm1

psb_spnrm1(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 1-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.