Visible to Intel only — GUID: GUID-3605ACD9-02D1-46D7-B791-F2F76F0D9AEA
Visible to Intel only — GUID: GUID-3605ACD9-02D1-46D7-B791-F2F76F0D9AEA
?dotu
Computes a complex vector-vector dot product.
Syntax
res = cdotu(n, x, incx, y, incy)
res = zdotu(n, x, incx, y, incy)
res = dotu(x, y)
Include Files
- mkl.fi, blas.f90
Description
The ?dotu routines perform a vector-vector reduction operation defined as
where xi and yi are elements of complex vectors x and y.
Input Parameters
- n
-
INTEGER. Specifies the number of elements in vectors x and y.
- x
-
COMPLEX for cdotu
DOUBLE COMPLEX for zdotu
Array, size at least (1 + (n -1)*abs(incx)).
- incx
-
INTEGER. Specifies the increment for the elements of x.
- y
-
COMPLEX for cdotu
DOUBLE COMPLEX for zdotu
Array, size at least (1 + (n -1)*abs(incy)).
- incy
-
INTEGER. Specifies the increment for the elements of y.
Output Parameters
- res
-
COMPLEX for cdotu
DOUBLE COMPLEX for zdotu
Contains the result of the dot product of x and y, if n is positive. Otherwise, it contains 0.
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 dotu interface are the following:
- x
-
Holds the vector with the number of elements n.
- y
-
Holds the vector with the number of elements n.