1: *> \brief \b ZSCAL
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 ZSCAL(N,ZA,ZX,INCX)
12: *
13: * .. Scalar Arguments ..
14: * COMPLEX*16 ZA
15: * INTEGER INCX,N
16: * ..
17: * .. Array Arguments ..
18: * COMPLEX*16 ZX(*)
19: * ..
20: *
21: *
22: *> \par Purpose:
23: * =============
24: *>
25: *> \verbatim
26: *>
27: *> ZSCAL scales a vector by a constant.
28: *> \endverbatim
29: *
30: * Arguments:
31: * ==========
32: *
33: *> \param[in] N
34: *> \verbatim
35: *> N is INTEGER
36: *> number of elements in input vector(s)
37: *> \endverbatim
38: *>
39: *> \param[in] ZA
40: *> \verbatim
41: *> ZA is COMPLEX*16
42: *> On entry, ZA specifies the scalar alpha.
43: *> \endverbatim
44: *>
45: *> \param[in,out] ZX
46: *> \verbatim
47: *> ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
48: *> \endverbatim
49: *>
50: *> \param[in] INCX
51: *> \verbatim
52: *> INCX is INTEGER
53: *> storage spacing between elements of ZX
54: *> \endverbatim
55: *
56: * Authors:
57: * ========
58: *
59: *> \author Univ. of Tennessee
60: *> \author Univ. of California Berkeley
61: *> \author Univ. of Colorado Denver
62: *> \author NAG Ltd.
63: *
64: *> \date November 2017
65: *
66: *> \ingroup complex16_blas_level1
67: *
68: *> \par Further Details:
69: * =====================
70: *>
71: *> \verbatim
72: *>
73: *> jack dongarra, 3/11/78.
74: *> modified 3/93 to return if incx .le. 0.
75: *> modified 12/3/93, array(1) declarations changed to array(*)
76: *> \endverbatim
77: *>
78: * =====================================================================
79: SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
80: *
81: * -- Reference BLAS level1 routine (version 3.8.0) --
82: * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
83: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
84: * November 2017
85: *
86: * .. Scalar Arguments ..
87: COMPLEX*16 ZA
88: INTEGER INCX,N
89: * ..
90: * .. Array Arguments ..
91: COMPLEX*16 ZX(*)
92: * ..
93: *
94: * =====================================================================
95: *
96: * .. Local Scalars ..
97: INTEGER I,NINCX
98: * ..
99: IF (N.LE.0 .OR. INCX.LE.0) RETURN
100: IF (INCX.EQ.1) THEN
101: *
102: * code for increment equal to 1
103: *
104: DO I = 1,N
105: ZX(I) = ZA*ZX(I)
106: END DO
107: ELSE
108: *
109: * code for increment not equal to 1
110: *
111: NINCX = N*INCX
112: DO I = 1,NINCX,INCX
113: ZX(I) = ZA*ZX(I)
114: END DO
115: END IF
116: RETURN
117: END
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