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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:

T res(i) ← x(:,i) 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)

res, x, y Subroutine
Short Precision Real psb_gedots
Long Precision Real psb_gedots
Short Precision Complexpsb_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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