Developer Reference for Intel® oneAPI Math Kernel Library for Fortran
?scal
Computes the product of a vector by a scalar.
Syntax
call sscal(n, a, x, incx)
call dscal(n, a, x, incx)
call cscal(n, a, x, incx)
call zscal(n, a, x, incx)
call csscal(n, a, x, incx)
call zdscal(n, a, x, incx)
call scal(x, a)
Include Files
mkl.fi, mkl_blas.f90
Description
The ?scal routines perform a vector operation defined as x = a * x
where:
a is a scalar, x is an n -element vector.
Input Parameters
n
INTEGER . Specifies the number of elements in vector x .
- a
-
REAL for sscal and csscal DOUBLE PRECISION for dscal and zdscal COMPLEX for cscal DOUBLE COMPLEX for zscal Specifies the scalar a .
- x
-
REAL for sscal DOUBLE PRECISION for dscal COMPLEX for cscal and csscal DOUBLE COMPLEX for zscal and zdscal Array, size at least (1 + (n -1)*abs(incx)) .
incx
INTEGER . Specifies the increment for the elements of x .
Output Parameters
- x
-
Updated vector x .
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions .
Specific details for the routine scal interface are the following:
- x
-
Holds the vector with the number of elements n .