NAME

SRC/dlarscl2.f

SYNOPSIS

Functions/Subroutines

subroutine dlarscl2 (m, n, d, x, ldx)
DLARSCL2 performs reciprocal diagonal scaling on a matrix.

Function/Subroutine Documentation

subroutine dlarscl2 (integer m, integer n, double precision, dimension( * ) d, double precision, dimension( ldx, * ) x, integer ldx)

DLARSCL2 performs reciprocal diagonal scaling on a matrix.

Purpose:



 DLARSCL2 performs a reciprocal diagonal scaling on a matrix:


   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 is INTEGER


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



          N is INTEGER


     The number of columns of X. N >= 0.



          D is DOUBLE PRECISION array, dimension (M)


     Diagonal matrix D, stored as a vector of length M.



          X is DOUBLE PRECISION array, dimension (LDX,N)


     On entry, the matrix X to be scaled by D.


     On exit, the scaled matrix.

LDX



          LDX is INTEGER


     The leading dimension of the matrix X. LDX >= M.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 89 of file dlarscl2.f.

Author

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