psb_gedots -- Generalized Dot Product

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

$$res(i) \leftarrow x(:,i)^T y(:,i)$$

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)

Table 3: Data types

$res$, $x$, $y$	Subroutine
Short Precision Real	psb_gedots
Long Precision Real	psb_gedots
Short Precision Complex	psb_gedots
Long Precision Complex	psb_gedots

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 vdatapsb_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 vdatapsb_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 descdatapsb_desc_type.

On Return

res

is the dot product of subvectors $x$ 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.