2. EL 7
  3. lapack
  4. DLARSCL2(3)

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dlarscl2.f(3) LAPACK dlarscl2.f(3)

NAME

dlarscl2.f -

SYNOPSIS

Functions/Subroutines


subroutine dlarscl2 (M, N, D, X, LDX)
DLARSCL2 performs reciprocal diagonal scaling on a vector.

Function/Subroutine Documentation

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.

Author

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Tue Sep 25 2012 Version 3.4.2