 LAPACK  3.10.1 LAPACK: Linear Algebra PACKage

## ◆ dlarscl2()

 subroutine dlarscl2 ( integer M, integer N, double precision, dimension( * ) D, double precision, dimension( ldx, * ) X, integer LDX )

DLARSCL2 performs reciprocal diagonal scaling on a vector.

Purpose:
``` DLARSCL2 performs a reciprocal diagonal scaling on an vector:
x <-- inv(D) * x
where the diagonal matrix D is stored as a vector.

Eventually to be replaced by BLAS_dge_diag_scale in the new BLAS
standard.```
Parameters
 [in] M ``` M is INTEGER The number of rows of D and X. M >= 0.``` [in] N ``` N is INTEGER The number of columns of X. N >= 0.``` [in] D ``` D is DOUBLE PRECISION array, dimension (M) Diagonal matrix D, stored as a vector of length M.``` [in,out] X ``` X is DOUBLE PRECISION array, dimension (LDX,N) On entry, the vector X to be scaled by D. On exit, the scaled vector.``` [in] LDX ``` LDX is INTEGER The leading dimension of the vector X. LDX >= M.```

Definition at line 89 of file dlarscl2.f.

90 *
91 * -- LAPACK computational routine --
92 * -- LAPACK is a software package provided by Univ. of Tennessee, --
93 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
94 *
95 * .. Scalar Arguments ..
96  INTEGER M, N, LDX
97 * ..
98 * .. Array Arguments ..
99  DOUBLE PRECISION D( * ), X( LDX, * )
100 * ..
101 *
102 * =====================================================================
103 *
104 * .. Local Scalars ..
105  INTEGER I, J
106 * ..
107 * .. Executable Statements ..
108 *
109  DO j = 1, n
110  DO i = 1, m
111  x( i, j ) = x( i, j ) / d( i )
112  END DO
113  END DO
114
115  RETURN