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Annotation of rpl/lapack/lapack/dlascl2.f, revision 1.17

1.17    ! bertrand    1: *> \brief \b DLASCL2 performs diagonal scaling on a matrix.
1.5       bertrand    2: *
                      3: *  =========== DOCUMENTATION ===========
                      4: *
1.14      bertrand    5: * Online html documentation available at
                      6: *            http://www.netlib.org/lapack/explore-html/
1.5       bertrand    7: *
                      8: *> \htmlonly
1.14      bertrand    9: *> Download DLASCL2 + dependencies
                     10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlascl2.f">
                     11: *> [TGZ]</a>
                     12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlascl2.f">
                     13: *> [ZIP]</a>
                     14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlascl2.f">
1.5       bertrand   15: *> [TXT]</a>
1.14      bertrand   16: *> \endhtmlonly
1.5       bertrand   17: *
                     18: *  Definition:
                     19: *  ===========
                     20: *
                     21: *       SUBROUTINE DLASCL2 ( M, N, D, X, LDX )
1.14      bertrand   22: *
1.5       bertrand   23: *       .. Scalar Arguments ..
                     24: *       INTEGER            M, N, LDX
                     25: *       ..
                     26: *       .. Array Arguments ..
                     27: *       DOUBLE PRECISION   D( * ), X( LDX, * )
                     28: *       ..
1.14      bertrand   29: *
1.5       bertrand   30: *
                     31: *> \par Purpose:
                     32: *  =============
                     33: *>
                     34: *> \verbatim
                     35: *>
1.17    ! bertrand   36: *> DLASCL2 performs a diagonal scaling on a matrix:
1.5       bertrand   37: *>   x <-- D * x
                     38: *> where the diagonal matrix D is stored as a vector.
                     39: *>
                     40: *> Eventually to be replaced by BLAS_dge_diag_scale in the new BLAS
                     41: *> standard.
                     42: *> \endverbatim
                     43: *
                     44: *  Arguments:
                     45: *  ==========
                     46: *
                     47: *> \param[in] M
                     48: *> \verbatim
                     49: *>          M is INTEGER
                     50: *>     The number of rows of D and X. M >= 0.
                     51: *> \endverbatim
                     52: *>
                     53: *> \param[in] N
                     54: *> \verbatim
                     55: *>          N is INTEGER
1.11      bertrand   56: *>     The number of columns of X. N >= 0.
1.5       bertrand   57: *> \endverbatim
                     58: *>
                     59: *> \param[in] D
                     60: *> \verbatim
                     61: *>          D is DOUBLE PRECISION array, length M
                     62: *>     Diagonal matrix D, stored as a vector of length M.
                     63: *> \endverbatim
                     64: *>
                     65: *> \param[in,out] X
                     66: *> \verbatim
                     67: *>          X is DOUBLE PRECISION array, dimension (LDX,N)
1.17    ! bertrand   68: *>     On entry, the matrix X to be scaled by D.
        !            69: *>     On exit, the scaled matrix.
1.5       bertrand   70: *> \endverbatim
                     71: *>
                     72: *> \param[in] LDX
                     73: *> \verbatim
                     74: *>          LDX is INTEGER
1.17    ! bertrand   75: *>     The leading dimension of the matrix X. LDX >= M.
1.5       bertrand   76: *> \endverbatim
                     77: *
                     78: *  Authors:
                     79: *  ========
                     80: *
1.14      bertrand   81: *> \author Univ. of Tennessee
                     82: *> \author Univ. of California Berkeley
                     83: *> \author Univ. of Colorado Denver
                     84: *> \author NAG Ltd.
1.5       bertrand   85: *
                     86: *> \ingroup doubleOTHERcomputational
                     87: *
                     88: *  =====================================================================
1.1       bertrand   89:       SUBROUTINE DLASCL2 ( M, N, D, X, LDX )
                     90: *
1.17    ! bertrand   91: *  -- LAPACK computational routine --
1.5       bertrand   92: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
                     93: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.1       bertrand   94: *
                     95: *     .. Scalar Arguments ..
                     96:       INTEGER            M, N, LDX
                     97: *     ..
                     98: *     .. Array Arguments ..
                     99:       DOUBLE PRECISION   D( * ), X( LDX, * )
                    100: *     ..
                    101: *
                    102: *  =====================================================================
                    103: *
                    104: *     .. Local Scalars ..
                    105:       INTEGER            I, J
                    106: *     ..
                    107: *     .. Executable Statements ..
                    108: *
                    109:       DO J = 1, N
                    110:          DO I = 1, M
                    111:             X( I, J ) = X( I, J ) * D( I )
                    112:          END DO
                    113:       END DO
                    114: 
                    115:       RETURN
                    116:       END