Annotation of rpl/lapack/blas/zswap.f, revision 1.8
1.8 ! bertrand 1: *> \brief \b ZSWAP
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: * Definition:
! 9: * ===========
! 10: *
! 11: * SUBROUTINE ZSWAP(N,ZX,INCX,ZY,INCY)
! 12: *
! 13: * .. Scalar Arguments ..
! 14: * INTEGER INCX,INCY,N
! 15: * ..
! 16: * .. Array Arguments ..
! 17: * COMPLEX*16 ZX(*),ZY(*)
! 18: * ..
! 19: *
! 20: *
! 21: *> \par Purpose:
! 22: * =============
! 23: *>
! 24: *> \verbatim
! 25: *>
! 26: *> ZSWAP interchanges two vectors.
! 27: *> \endverbatim
! 28: *
! 29: * Authors:
! 30: * ========
! 31: *
! 32: *> \author Univ. of Tennessee
! 33: *> \author Univ. of California Berkeley
! 34: *> \author Univ. of Colorado Denver
! 35: *> \author NAG Ltd.
! 36: *
! 37: *> \date November 2011
! 38: *
! 39: *> \ingroup complex16_blas_level1
! 40: *
! 41: *> \par Further Details:
! 42: * =====================
! 43: *>
! 44: *> \verbatim
! 45: *>
! 46: *> jack dongarra, 3/11/78.
! 47: *> modified 12/3/93, array(1) declarations changed to array(*)
! 48: *> \endverbatim
! 49: *>
! 50: * =====================================================================
1.1 bertrand 51: SUBROUTINE ZSWAP(N,ZX,INCX,ZY,INCY)
1.8 ! bertrand 52: *
! 53: * -- Reference BLAS level1 routine (version 3.4.0) --
! 54: * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
! 55: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
! 56: * November 2011
! 57: *
1.1 bertrand 58: * .. Scalar Arguments ..
59: INTEGER INCX,INCY,N
60: * ..
61: * .. Array Arguments ..
1.8 ! bertrand 62: COMPLEX*16 ZX(*),ZY(*)
1.1 bertrand 63: * ..
64: *
65: * =====================================================================
66: *
67: * .. Local Scalars ..
1.8 ! bertrand 68: COMPLEX*16 ZTEMP
1.1 bertrand 69: INTEGER I,IX,IY
70: * ..
71: IF (N.LE.0) RETURN
1.7 bertrand 72: IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN
73: *
74: * code for both increments equal to 1
75: DO I = 1,N
76: ZTEMP = ZX(I)
77: ZX(I) = ZY(I)
78: ZY(I) = ZTEMP
79: END DO
80: ELSE
1.1 bertrand 81: *
82: * code for unequal increments or equal increments not equal
83: * to 1
84: *
1.7 bertrand 85: IX = 1
86: IY = 1
87: IF (INCX.LT.0) IX = (-N+1)*INCX + 1
88: IF (INCY.LT.0) IY = (-N+1)*INCY + 1
89: DO I = 1,N
90: ZTEMP = ZX(IX)
91: ZX(IX) = ZY(IY)
92: ZY(IY) = ZTEMP
93: IX = IX + INCX
94: IY = IY + INCY
95: END DO
96: END IF
1.1 bertrand 97: RETURN
98: END
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