LAPACK  3.6.1 LAPACK: Linear Algebra PACKage
 subroutine zaxpy ( integer N, complex*16 ZA, complex*16, dimension(*) ZX, integer INCX, complex*16, dimension(*) ZY, integer INCY )

ZAXPY

Purpose:
ZAXPY constant times a vector plus a vector.
Date
November 2011
Further Details:
jack dongarra, 3/11/78.
modified 12/3/93, array(1) declarations changed to array(*)

Definition at line 53 of file zaxpy.f.

53 *
54 * -- Reference BLAS level1 routine (version 3.4.0) --
55 * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
56 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
57 * November 2011
58 *
59 * .. Scalar Arguments ..
60  COMPLEX*16 za
61  INTEGER incx,incy,n
62 * ..
63 * .. Array Arguments ..
64  COMPLEX*16 zx(*),zy(*)
65 * ..
66 *
67 * =====================================================================
68 *
69 * .. Local Scalars ..
70  INTEGER i,ix,iy
71 * ..
72 * .. External Functions ..
73  DOUBLE PRECISION dcabs1
74  EXTERNAL dcabs1
75 * ..
76  IF (n.LE.0) RETURN
77  IF (dcabs1(za).EQ.0.0d0) RETURN
78  IF (incx.EQ.1 .AND. incy.EQ.1) THEN
79 *
80 * code for both increments equal to 1
81 *
82  DO i = 1,n
83  zy(i) = zy(i) + za*zx(i)
84  END DO
85  ELSE
86 *
87 * code for unequal increments or equal increments
88 * not equal to 1
89 *
90  ix = 1
91  iy = 1
92  IF (incx.LT.0) ix = (-n+1)*incx + 1
93  IF (incy.LT.0) iy = (-n+1)*incy + 1
94  DO i = 1,n
95  zy(iy) = zy(iy) + za*zx(ix)
96  ix = ix + incx
97  iy = iy + incy
98  END DO
99  END IF
100 *
101  RETURN
double precision function dcabs1(Z)
DCABS1
Definition: dcabs1.f:41