# psb_geaxpby — General Dense Matrix Sum

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#### 4.1 psb_geaxpby — General Dense Matrix Sum

This subroutine is an interface to the computational kernel for dense matrix sum:

call psb_geaxpby(alpha, x, beta, y, desc_a, info)

x, y, α, β | Subroutine

Short Precision Real | psb_geaxpby
Long Precision Real | psb_geaxpby
Short Precision Complex | psb_geaxpby
Long Precision Complex | psb_geaxpby

Table 1: Data types

Type:
  Synchronous.
On Entry
alpha
  the scalar α.
  Scope: global
  Type: required
  Intent: in.
  Specified as: a number of the data type indicated in Table 1.
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 1. The rank of x must be the same of y.
beta
  the scalar β.
  Scope: global
  Type: required
  Intent: in.
  Specified as: a number of the data type indicated in Table 1.
y
  the local portion of the global dense matrix y.
  Scope: local
  Type: required
  Intent: inout.
  Specified as: a rank one or two array or an object of type psb_T_vect_type containing numbers of the type indicated in Table 1. The rank of y must be the same of x.
desc_a
  contains data structures for communications.
  Scope: local
  Type: required
  Intent: in.
  Specified as: an object of type psb_desc_type.

On Return
y
  the local portion of result submatrix y.
  Scope: local
  Type: required
  Intent: inout.
  Specified as: a rank one or two array or an object of type psb_T_vect_type containing numbers of the type indicated in Table 1.
info
  Error code.
  Scope: local
  Type: required
  Intent: out.
  An integer value; 0 means no error has been detected.

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