123 lines
3.0 KiB
Fortran
123 lines
3.0 KiB
Fortran
*> \brief \b CLARSCL2 performs reciprocal diagonal scaling on a vector.
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
*> \htmlonly
|
|
*> Download CLARSCL2 + dependencies
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/clarscl2.f">
|
|
*> [TGZ]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/clarscl2.f">
|
|
*> [ZIP]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/clarscl2.f">
|
|
*> [TXT]</a>
|
|
*> \endhtmlonly
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* SUBROUTINE CLARSCL2 ( M, N, D, X, LDX )
|
|
*
|
|
* .. Scalar Arguments ..
|
|
* INTEGER M, N, LDX
|
|
* ..
|
|
* .. Array Arguments ..
|
|
* COMPLEX X( LDX, * )
|
|
* REAL D( * )
|
|
* ..
|
|
*
|
|
*
|
|
*> \par Purpose:
|
|
* =============
|
|
*>
|
|
*> \verbatim
|
|
*>
|
|
*> CLARSCL2 performs a reciprocal diagonal scaling on an vector:
|
|
*> x <-- inv(D) * x
|
|
*> where the REAL diagonal matrix D is stored as a vector.
|
|
*>
|
|
*> Eventually to be replaced by BLAS_cge_diag_scale in the new BLAS
|
|
*> standard.
|
|
*> \endverbatim
|
|
*
|
|
* Arguments:
|
|
* ==========
|
|
*
|
|
*> \param[in] M
|
|
*> \verbatim
|
|
*> M is INTEGER
|
|
*> The number of rows of D and X. M >= 0.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] N
|
|
*> \verbatim
|
|
*> N is INTEGER
|
|
*> The number of columns of X. N >= 0.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] D
|
|
*> \verbatim
|
|
*> D is REAL array, length M
|
|
*> Diagonal matrix D, stored as a vector of length M.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in,out] X
|
|
*> \verbatim
|
|
*> X is COMPLEX array, dimension (LDX,N)
|
|
*> On entry, the vector X to be scaled by D.
|
|
*> On exit, the scaled vector.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] LDX
|
|
*> \verbatim
|
|
*> LDX is INTEGER
|
|
*> The leading dimension of the vector X. LDX >= 0.
|
|
*> \endverbatim
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Univ. of Tennessee
|
|
*> \author Univ. of California Berkeley
|
|
*> \author Univ. of Colorado Denver
|
|
*> \author NAG Ltd.
|
|
*
|
|
*> \date November 2015
|
|
*
|
|
*> \ingroup complexOTHERcomputational
|
|
*
|
|
* =====================================================================
|
|
SUBROUTINE CLARSCL2 ( M, N, D, X, LDX )
|
|
*
|
|
* -- LAPACK computational routine (version 3.6.0) --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
* November 2015
|
|
*
|
|
* .. Scalar Arguments ..
|
|
INTEGER M, N, LDX
|
|
* ..
|
|
* .. Array Arguments ..
|
|
COMPLEX X( LDX, * )
|
|
REAL D( * )
|
|
* ..
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Local Scalars ..
|
|
INTEGER I, J
|
|
* ..
|
|
* .. Executable Statements ..
|
|
*
|
|
DO J = 1, N
|
|
DO I = 1, M
|
|
X( I, J ) = X( I, J ) / D( I )
|
|
END DO
|
|
END DO
|
|
|
|
RETURN
|
|
END
|
|
|