LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ slascl2()

subroutine slascl2 ( integer  M,
integer  N,
real, dimension( * )  D,
real, dimension( ldx, * )  X,
integer  LDX 
)

SLASCL2 performs diagonal scaling on a vector.

Download SLASCL2 + dependencies [TGZ] [ZIP] [TXT]

Purpose:
 SLASCL2 performs a diagonal scaling on a vector:
   x <-- D * x
 where the diagonal matrix D is stored as a vector.

 Eventually to be replaced by BLAS_sge_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 REAL array, length M
     Diagonal matrix D, stored as a vector of length M.
[in,out]X
          X is REAL 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.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.

Definition at line 89 of file slascl2.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  REAL 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
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