4.10 psb_norm1 — 1-Norm of Sparse Matrix
This function computes the 1-norm of a matrix A:
where:
-
A
- represents the global matrix A
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| A | Function |
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| Short Precision Real | psb_spnrm1 |
| Long Precision Real | psb_spnrm1 |
| Short Precision Complex | psb_spnrm1 |
| Long Precision Complex | psb_spnrm1 |
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Table 10: Data types
psb_spnrm1(A, desc_a, info)
psb_norm1(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.
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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.