Visible to Intel only — GUID: GUID-12E39EB6-828C-466E-ABDE-BEDEF08D1C1B
Visible to Intel only — GUID: GUID-12E39EB6-828C-466E-ABDE-BEDEF08D1C1B
p?asum
Computes the sum of magnitudes of elements of a distributed vector.
Syntax
call psasum(n, asum, x, ix, jx, descx, incx)
call pscasum(n, asum, x, ix, jx, descx, incx)
call pdasum(n, asum, x, ix, jx, descx, incx)
call pdzasum(n, asum, x, ix, jx, descx, incx)
Include Files
- mkl_pblas.h
Description
The functions p?asum compute the sum of the magnitudes of elements of a distributed vector sub(x),
where sub(x) denotes X(ix, jx:jx+n-1) if incx=m_x, and X(ix: ix+n-1, jx) if incx= 1.
Input Parameters
- n
-
(global) INTEGER. The length of distributed vector sub(x), n≥0.
- x
-
(local) REAL for psasum
DOUBLE PRECISION for pdasum
COMPLEX for pscasum
DOUBLE COMPLEX for pdzasum
Array, size (jx-1)*m_x + ix+(n-1)*abs(incx)).
This array contains the entries of the distributed vector sub(x).
- ix, jx
-
(global) INTEGER. The row and column indices in the distributed matrix X indicating the first row and the first column of the submatrix sub(X), respectively.
- descx
-
(global and local) INTEGER array of dimension 9. The array descriptor of the distributed matrix X.
- incx
-
(global) INTEGER. Specifies the increment for the elements of sub(x). Only two values are supported, namely 1 and m_x. incx must not be zero.
Output Parameters
- asum
-
(local) REAL for psasum and pscasum.
DOUBLE PRECISION for pdasum and pdzasum
Contains the sum of magnitudes of elements of the distributed vector only in its scope.