1*> \brief \b SLARSCL2 performs reciprocal diagonal scaling on a vector.
2*
3*  =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6*            http://www.netlib.org/lapack/explore-html/
7*
8*> \htmlonly
9*> Download SLARSCL2 + dependencies
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13*> [ZIP]</a>
14*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/slarscl2.f">
15*> [TXT]</a>
16*> \endhtmlonly
17*
18*  Definition:
19*  ===========
20*
21*       SUBROUTINE SLARSCL2 ( M, N, D, X, LDX )
22*
23*       .. Scalar Arguments ..
24*       INTEGER            M, N, LDX
25*       ..
26*       .. Array Arguments ..
27*       REAL               D( * ), X( LDX, * )
28*       ..
29*
30*
31*> \par Purpose:
32*  =============
33*>
34*> \verbatim
35*>
36*> SLARSCL2 performs a reciprocal diagonal scaling on an vector:
37*>   x <-- inv(D) * x
38*> where the diagonal matrix D is stored as a vector.
39*>
40*> Eventually to be replaced by BLAS_sge_diag_scale in the new BLAS
41*> standard.
42*> \endverbatim
43*
44*  Arguments:
45*  ==========
46*
47*> \param[in] M
48*> \verbatim
49*>          M is INTEGER
50*>     The number of rows of D and X. M >= 0.
51*> \endverbatim
52*>
53*> \param[in] N
54*> \verbatim
55*>          N is INTEGER
56*>     The number of columns of X. N >= 0.
57*> \endverbatim
58*>
59*> \param[in] D
60*> \verbatim
61*>          D is REAL array, length M
62*>     Diagonal matrix D, stored as a vector of length M.
63*> \endverbatim
64*>
65*> \param[in,out] X
66*> \verbatim
67*>          X is REAL array, dimension (LDX,N)
68*>     On entry, the vector X to be scaled by D.
69*>     On exit, the scaled vector.
70*> \endverbatim
71*>
72*> \param[in] LDX
73*> \verbatim
74*>          LDX is INTEGER
75*>     The leading dimension of the vector X. LDX >= 0.
76*> \endverbatim
77*
78*  Authors:
79*  ========
80*
81*> \author Univ. of Tennessee
82*> \author Univ. of California Berkeley
83*> \author Univ. of Colorado Denver
84*> \author NAG Ltd.
85*
86*> \date November 2015
87*
88*> \ingroup realOTHERcomputational
89*
90*  =====================================================================
91      SUBROUTINE SLARSCL2 ( M, N, D, X, LDX )
92*
93*  -- LAPACK computational routine (version 3.6.0) --
94*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
95*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
96*     November 2015
97*
98*     .. Scalar Arguments ..
99      INTEGER            M, N, LDX
100*     ..
101*     .. Array Arguments ..
102      REAL               D( * ), X( LDX, * )
103*     ..
104*
105*  =====================================================================
106*
107*     .. Local Scalars ..
108      INTEGER            I, J
109*     ..
110*     .. Executable Statements ..
111*
112      DO J = 1, N
113         DO I = 1, M
114            X( I, J ) = X( I, J ) / D( I )
115         END DO
116      END DO
117
118      RETURN
119      END
120