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Technical Reference: Base Operating System and Extensions, Volume 2
SSWAP, DSWAP, CSWAP, or ZSWAP Subroutine
Purpose
Interchanges vectors X and Y.
Library
BLAS Library (libblas.a)
FORTRAN Syntax
SUBROUTINE SSWAP(N,X,INCX,Y,INCY)
INTEGER INCX, INCY, N
REAL X(*), Y(*)
SUBROUTINE DSWAP(N,X,INCX,Y,INCY)
INTEGER INCX,INCY,N
DOUBLE PRECISION X(*),Y(*)
SUBROUTINE CSWAP(N,X,INCX,Y,INCY)
INTEGER INCX,INCY,N
COMPLEX X(*),Y(*)
SUBROUTINE ZSWAP(N,X,INCX,Y,INCY)
INTEGER INCX,INCY,N
COMPLEX*16 X(*),Y(*)
Description
The SSWAP, DSWAP, CSWAP, or ZSWAP subroutine interchanges vector X and vector Y.
Parameters
N |
On entry, N specifies the number of elements in X and Y; unchanged on exit. |
X |
Vector of dimension at least (1 + (N-1) * abs(INCX) ); on exit, contains the elements of vector Y. |
INCX |
On entry, INCX specifies the increment for the elements of X; unchanged on exit. |
Y |
Vector of dimension at least (1 + (N-1) * abs(INCY) ); on exit, contains the elements of vector X. |
INCY |
On entry, INCY specifies the increment for the elements of Y; unchanged on exit. |
Error Codes
For values of N <= 0, the subroutines return immediately.
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