# psb_normi — Infinity Norm of Sparse Matrix

[next] [prev] [prev-tail] [tail] [up]

#### 4.11 psb_normi — Infinity Norm of Sparse Matrix

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

where:

A
  represents the global matrix A

A | Function

Short Precision Real | psb_spnrmi
Long Precision Real | psb_spnrmi
Short Precision Complex | psb_spnrmi
Long Precision Complex | psb_spnrmi

Table 11: Data types

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

[next] [prev] [prev-tail] [front] [up]