Visible to Intel only — GUID: GUID-A15C6735-DE94-4396-8AE7-40F5EA20765A
Visible to Intel only — GUID: GUID-A15C6735-DE94-4396-8AE7-40F5EA20765A
p?scal
Computes a product of a distributed vector by a scalar.
Syntax
call psscal(n, a, x, ix, jx, descx, incx)
call pdscal(n, a, x, ix, jx, descx, incx)
call pcscal(n, a, x, ix, jx, descx, incx)
call pzscal(n, a, x, ix, jx, descx, incx)
call pcsscal(n, a, x, ix, jx, descx, incx)
call pzdscal(n, a, x, ix, jx, descx, incx)
Include Files
- mkl_pblas.h
Description
The p?scal routines multiplies a n-element distributed vector sub(x) by the scalar a:
sub(x) = a*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.
- a
-
(global) REAL for psscal and pcsscal
DOUBLE PRECISION for pdscal and pzdscal
COMPLEX for pcscal
DOUBLE COMPLEX for pzscal
Specifies the scalar a.
- x
-
(local) REAL for psscal
DOUBLE PRECISION for pdscal
COMPLEX for pcscal and pcsscal
DOUBLE COMPLEX for pzscal and pzdscal
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
- x
-
Overwritten by the updated distributed vector sub(x)