Visible to Intel only — GUID: GUID-5E6A0E99-1174-4413-9C6D-60C0B0754645
Visible to Intel only — GUID: GUID-5E6A0E99-1174-4413-9C6D-60C0B0754645
p?dotc
Computes the dot product of two distributed complex vectors, one of them is conjugated.
Syntax
call pcdotc(n, dotc, x, ix, jx, descx, incx, y, iy, jy, descy, incy)
call pzdotc(n, dotc, x, ix, jx, descx, incx, y, iy, jy, descy, incy)
Include Files
- mkl_pblas.h
Description
The p?dotc functions compute the dot product dotc of two distributed vectors, with one vector conjugated:
dotc = conjg(sub(x)')*sub(y)
where sub(x) and sub(y) are n-element distributed vectors.
sub(x) denotes X(ix, jx:jx+n-1) if incx=m_x, and X(ix: ix+n-1, jx) if incx= 1;
sub(y) denotes Y(iy, jy:jy+n-1) if incy=m_y, and Y(iy: iy+n-1, jy) if incy= 1.
Input Parameters
- n
-
(global) INTEGER. The length of distributed vectors, n≥0.
- x
-
(local)COMPLEX for pcdotc
DOUBLE COMPLEX for pzdotc
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.
- y
-
(local) COMPLEX for pcdotc
DOUBLE COMPLEX for pzdotc
Array, size (jy-1)*m_y + iy+(n-1)*abs(incy)).
This array contains the entries of the distributed vector sub(y).
- iy, jy
-
(global) INTEGER. The row and column indices in the distributed matrix Y indicating the first row and the first column of the submatrix sub(Y), respectively.
- descy
-
(global and local) INTEGER array of dimension 9. The array descriptor of the distributed matrix Y.
- incy
-
(global) INTEGER. Specifies the increment for the elements of sub(y). Only two values are supported, namely 1 and m_y. incy must not be zero.
Output Parameters
- dotc
-
(local) COMPLEX for pcdotc
DOUBLE COMPLEX for pzdotc
Dot product of sub(x) and sub(y) only in their scope.