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.