Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     dswap - Exchange vectors x and y.

SYNOPSIS

     SUBROUTINE DSWAP(N, X, INCX, Y, INCY)

     INTEGER N, INCX, INCY
     DOUBLE PRECISION X(*), Y(*)

     SUBROUTINE DSWAP_64(N, X, INCX, Y, INCY)

     INTEGER*8 N, INCX, INCY
     DOUBLE PRECISION X(*), Y(*)

  F95 INTERFACE
     SUBROUTINE SWAP([N], X, [INCX], Y, [INCY])

     INTEGER :: N, INCX, INCY
     REAL(8), DIMENSION(:) :: X, Y

     SUBROUTINE SWAP_64([N], X, [INCX], Y, [INCY])

     INTEGER(8) :: N, INCX, INCY
     REAL(8), DIMENSION(:) :: X, Y

  C INTERFACE
     #include <sunperf.h>

     void dswap(int n, double *x, int incx, double *y, int incy);

     void dswap_64(long n, double *x, long incx, double *y,  long
               incy);

PURPOSE

     dswap Exchange x and y where x and y are n-vectors.

ARGUMENTS

     N (input)
               On entry, N specifies the number  of  elements  in
               the  vector.   N must be at least one for the sub-
               routine to have any visible effect.  Unchanged  on
               exit.
     X (input/output)
               ( 1 + ( n - 1 )*abs( INCX  )  ).   On  entry,  the
               incremented array X must contain the vector x.  On
               exit, the y vector.

     INCX (input)
               On entry, INCX specifies  the  increment  for  the
               elements of X. Unchanged on exit.

     Y (input/output)
               ( 1 + ( n - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented array Y must contain the vector y.  On
               exit, the x vector.

     INCY (input)
               On entry, INCY specifies  the  increment  for  the
               elements of Y. Unchanged on exit.