4.5 psb_geamaxs — Generalized Infinity Norm
This subroutine computes a series of infinity norms on the columns of a dense matrix
x:
call psb_geamaxs(res, x, desc_a, info)
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| res | x | Subroutine |
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| Short Precision Real | Short Precision Real | psb_geamaxs |
| Long Precision Real | Long Precision Real | psb_geamaxs |
| Short Precision Real | Short Precision Complex | psb_geamaxs |
| Long Precision Real | Long Precision Complex | psb_geamaxs |
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Table 5: Data types
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Type:
- Synchronous.
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On Entry
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x
- the local portion of global dense matrix x.
Scope: local
Type: required
Intent: in.
Specified as: a rank one or two array or an object of type
psb_T_vect_type containing numbers of type specified in Table 5.
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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
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res
- is the infinity norm of the columns of x.
Scope: global
Intent: out.
Specified as: a number or a rank-one array of long precision real numbers.
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info
- Error code.
Scope: local
Type: required
Intent: out.
An integer value; 0 means no error has been detected.