?swap

Syntax

FORTRAN 77:

call sswap(n, x, incx, y, incy)

call dswap(n, x, incx, y, incy)

call cswap(n, x, incx, y, incy)

call zswap(n, x, incx, y, incy)

Fortran 95:

call swap(x, y)

Include Files

The FORTRAN 77 interfaces are specified in the mkl_blas.fi include file, the Fortran 95 interfaces are specified in the blas.f90 include file, and the C interfaces are specified in the mkl_blas.h include file.

Description

Given two vectors x and y, the ?swap routines return vectors y and x swapped, each replacing the other.

Input Parameters

n

INTEGER. Specifies the number of elements in vectors x and y.

x

REAL for sswap

DOUBLE PRECISION for dswap

COMPLEX for cswap

DOUBLE COMPLEX for zswap

Array, DIMENSION at least (1 + (n-1)*abs(incx)).

incx

INTEGER. Specifies the increment for the elements of x.

y

REAL for sswap

DOUBLE PRECISION for dswap

COMPLEX for cswap

DOUBLE COMPLEX for zswap

Array, DIMENSION at least (1 + (n-1)*abs(incy)).

incy

INTEGER. Specifies the increment for the elements of y.

Output Parameters

x

Contains the resultant vector x, that is, the input vector y.

y

Contains the resultant vector y, that is, the input vector x.

Fortran 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 Fortran 95 Interface Conventions.

Specific details for the routine swap interface are the following:

x

Holds the vector with the number of elements n.

y

Holds the vector with the number of elements n.