Annotation of rpl/lapack/blas/zaxpy.f, revision 1.1
1.1 ! bertrand 1: SUBROUTINE ZAXPY(N,ZA,ZX,INCX,ZY,INCY)
! 2: * .. Scalar Arguments ..
! 3: DOUBLE COMPLEX ZA
! 4: INTEGER INCX,INCY,N
! 5: * ..
! 6: * .. Array Arguments ..
! 7: DOUBLE COMPLEX ZX(*),ZY(*)
! 8: * ..
! 9: *
! 10: * Purpose
! 11: * =======
! 12: *
! 13: * ZAXPY constant times a vector plus a vector.
! 14: *
! 15: * Further Details
! 16: * ===============
! 17: *
! 18: * jack dongarra, 3/11/78.
! 19: * modified 12/3/93, array(1) declarations changed to array(*)
! 20: *
! 21: * =====================================================================
! 22: *
! 23: * .. Local Scalars ..
! 24: INTEGER I,IX,IY
! 25: * ..
! 26: * .. External Functions ..
! 27: DOUBLE PRECISION DCABS1
! 28: EXTERNAL DCABS1
! 29: * ..
! 30: IF (N.LE.0) RETURN
! 31: IF (DCABS1(ZA).EQ.0.0d0) RETURN
! 32: IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
! 33: *
! 34: * code for unequal increments or equal increments
! 35: * not equal to 1
! 36: *
! 37: IX = 1
! 38: IY = 1
! 39: IF (INCX.LT.0) IX = (-N+1)*INCX + 1
! 40: IF (INCY.LT.0) IY = (-N+1)*INCY + 1
! 41: DO 10 I = 1,N
! 42: ZY(IY) = ZY(IY) + ZA*ZX(IX)
! 43: IX = IX + INCX
! 44: IY = IY + INCY
! 45: 10 CONTINUE
! 46: RETURN
! 47: *
! 48: * code for both increments equal to 1
! 49: *
! 50: 20 DO 30 I = 1,N
! 51: ZY(I) = ZY(I) + ZA*ZX(I)
! 52: 30 CONTINUE
! 53: RETURN
! 54: END
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