1: *> \brief \b ZDOTU
2: *
3: * =========== DOCUMENTATION ===========
4: *
5: * Online html documentation available at
6: * http://www.netlib.org/lapack/explore-html/
7: *
8: * Definition:
9: * ===========
10: *
11: * COMPLEX*16 FUNCTION ZDOTU(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: *> ZDOTU forms the dot product of two complex vectors
27: *> ZDOTU = X^T * Y
28: *>
29: *> \endverbatim
30: *
31: * Authors:
32: * ========
33: *
34: *> \author Univ. of Tennessee
35: *> \author Univ. of California Berkeley
36: *> \author Univ. of Colorado Denver
37: *> \author NAG Ltd.
38: *
39: *> \date November 2015
40: *
41: *> \ingroup complex16_blas_level1
42: *
43: *> \par Further Details:
44: * =====================
45: *>
46: *> \verbatim
47: *>
48: *> jack dongarra, 3/11/78.
49: *> modified 12/3/93, array(1) declarations changed to array(*)
50: *> \endverbatim
51: *>
52: * =====================================================================
53: COMPLEX*16 FUNCTION ZDOTU(N,ZX,INCX,ZY,INCY)
54: *
55: * -- Reference BLAS level1 routine (version 3.6.0) --
56: * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
57: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
58: * November 2015
59: *
60: * .. Scalar Arguments ..
61: INTEGER INCX,INCY,N
62: * ..
63: * .. Array Arguments ..
64: COMPLEX*16 ZX(*),ZY(*)
65: * ..
66: *
67: * =====================================================================
68: *
69: * .. Local Scalars ..
70: COMPLEX*16 ZTEMP
71: INTEGER I,IX,IY
72: * ..
73: ZTEMP = (0.0d0,0.0d0)
74: ZDOTU = (0.0d0,0.0d0)
75: IF (N.LE.0) RETURN
76: IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN
77: *
78: * code for both increments equal to 1
79: *
80: DO I = 1,N
81: ZTEMP = ZTEMP + ZX(I)*ZY(I)
82: END DO
83: ELSE
84: *
85: * code for unequal increments or equal increments
86: * not equal to 1
87: *
88: IX = 1
89: IY = 1
90: IF (INCX.LT.0) IX = (-N+1)*INCX + 1
91: IF (INCY.LT.0) IY = (-N+1)*INCY + 1
92: DO I = 1,N
93: ZTEMP = ZTEMP + ZX(IX)*ZY(IY)
94: IX = IX + INCX
95: IY = IY + INCY
96: END DO
97: END IF
98: ZDOTU = ZTEMP
99: RETURN
100: END
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