*> \brief \b CLASCL2 performs diagonal scaling on a vector. * * =========== DOCUMENTATION =========== * * Online html documentation available at * http://www.netlib.org/lapack/explore-html/ * *> \htmlonly *> Download CLASCL2 + dependencies *> *> [TGZ] *> *> [ZIP] *> *> [TXT] *> \endhtmlonly * * Definition: * =========== * * SUBROUTINE CLASCL2 ( M, N, D, X, LDX ) * * .. Scalar Arguments .. * INTEGER M, N, LDX * .. * .. Array Arguments .. * REAL D( * ) * COMPLEX X( LDX, * ) * .. * * *> \par Purpose: * ============= *> *> \verbatim *> *> CLASCL2 performs a diagonal scaling on a vector: *> x <-- D * x *> where the diagonal REAL 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 >= M. *> \endverbatim * * Authors: * ======== * *> \author Univ. of Tennessee *> \author Univ. of California Berkeley *> \author Univ. of Colorado Denver *> \author NAG Ltd. * *> \ingroup complexOTHERcomputational * * ===================================================================== SUBROUTINE CLASCL2 ( M, N, D, X, LDX ) * * -- LAPACK computational routine -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- * * .. Scalar Arguments .. INTEGER M, N, LDX * .. * .. Array Arguments .. REAL D( * ) COMPLEX X( LDX, * ) * .. * * ===================================================================== * * .. 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