# psb_gedots — Generalized Dot Product

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#### 4.3 psb_gedots — Generalized Dot Product

This subroutine computes a series of dot products among the columns of two dense matrices x and y:

If the matrices are complex, then the usual convention applies, i.e. the conjugate transpose of x is used. If x and y are of rank one, then res is a scalar, else it is a rank one array.

call psb_gedots(res, x, y, desc_a, info)

res, x, y | Subroutine

Short Precision Real | psb_gedots
Long Precision Real | psb_gedots
Short Precision Complex | psb_gedots
Long Precision Complex | psb_gedots

Table 3: Data types

Type:
  Synchronous.
On Entry
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 3. The rank of x must be the same of y.
y
  the local portion of global dense matrix y.
  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 3. 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
res
  is the dot product of vectors x and y.
  Scope: global
  Intent: out.
  Specified as: a number or a rank-one array of the data type indicated in Table 2.
info
  Error code.
  Scope: local
  Type: required
  Intent: out.
  An integer value; 0 means no error has been detected.

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