LAPACK 3.12.0 LAPACK: Linear Algebra PACKage
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csscal.f
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1*> \brief \b CSSCAL
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 CSSCAL(N,SA,CX,INCX)
12*
13* .. Scalar Arguments ..
14* REAL SA
15* INTEGER INCX,N
16* ..
17* .. Array Arguments ..
18* COMPLEX CX(*)
19* ..
20*
21*
22*> \par Purpose:
23* =============
24*>
25*> \verbatim
26*>
27*> CSSCAL scales a complex vector by a real 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] SA
40*> \verbatim
41*> SA is REAL
42*> On entry, SA specifies the scalar alpha.
43*> \endverbatim
44*>
45*> \param[in,out] CX
46*> \verbatim
47*> CX is COMPLEX 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 CX
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*> \ingroup scal
65*
66*> \par Further Details:
67* =====================
68*>
69*> \verbatim
70*>
71*> jack dongarra, linpack, 3/11/78.
72*> modified 3/93 to return if incx .le. 0.
73*> modified 12/3/93, array(1) declarations changed to array(*)
74*> \endverbatim
75*>
76* =====================================================================
77 SUBROUTINE csscal(N,SA,CX,INCX)
78*
79* -- Reference BLAS level1 routine --
80* -- Reference BLAS is a software package provided by Univ. of Tennessee, --
81* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
82*
83* .. Scalar Arguments ..
84 REAL SA
85 INTEGER INCX,N
86* ..
87* .. Array Arguments ..
88 COMPLEX CX(*)
89* ..
90*
91* =====================================================================
92*
93* .. Local Scalars ..
94 INTEGER I,NINCX
95* ..
96* .. Parameters ..
97 REAL ONE
98 parameter(one=1.0e+0)
99* ..
100* .. Intrinsic Functions ..
101 INTRINSIC aimag,cmplx,real
102* ..
103 IF (n.LE.0 .OR. incx.LE.0 .OR. sa.EQ.one) RETURN
104 IF (incx.EQ.1) THEN
105*
106* code for increment equal to 1
107*
108 DO i = 1,n
109 cx(i) = cmplx(sa*real(cx(i)),sa*aimag(cx(i)))
110 END DO
111 ELSE
112*
113* code for increment not equal to 1
114*
115 nincx = n*incx
116 DO i = 1,nincx,incx
117 cx(i) = cmplx(sa*real(cx(i)),sa*aimag(cx(i)))
118 END DO
119 END IF
120 RETURN
121*
122* End of CSSCAL
123*
124 END
subroutine csscal(n, sa, cx, incx)
CSSCAL
Definition csscal.f:78