dlarscl2.f (3)

Functions/Subroutines

subroutine dlarscl2 (M, N, D, X, LDX)

DLARSCL2 performs reciprocal diagonal scaling on a vector.

subroutine dlarscl2 (integerM, integerN, double precision, dimension( * )D, double precision, dimension( ldx, * )X, integerLDX)

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:

M

          M is INTEGER
     The number of rows of D and X. M >= 0.

N

          N is INTEGER
     The number of columns of D and X. N >= 0.

D

          D is DOUBLE PRECISION array, dimension (M)
     Diagonal matrix D, stored as a vector of length M.

X

          X is DOUBLE PRECISION array, dimension (LDX,N)
     On entry, the vector X to be scaled by D.
     On exit, the scaled vector.

LDX

          LDX is INTEGER
     The leading dimension of the vector X. LDX >= 0.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 91 of file dlarscl2.f.

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