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Annotation of rpl/lapack/lapack/dlascl2.f, revision 1.1

1.1     ! bertrand    1:       SUBROUTINE DLASCL2 ( M, N, D, X, LDX )
        !             2: *
        !             3: *     -- LAPACK routine (version 3.2.1)                               --
        !             4: *     -- Contributed by James Demmel, Deaglan Halligan, Yozo Hida and --
        !             5: *     -- Jason Riedy of Univ. of California Berkeley.                 --
        !             6: *     -- April 2009                                                   --
        !             7: *
        !             8: *     -- LAPACK is a software package provided by Univ. of Tennessee, --
        !             9: *     -- Univ. of California Berkeley and NAG Ltd.                    --
        !            10: *
        !            11:       IMPLICIT NONE
        !            12: *     ..
        !            13: *     .. Scalar Arguments ..
        !            14:       INTEGER            M, N, LDX
        !            15: *     ..
        !            16: *     .. Array Arguments ..
        !            17:       DOUBLE PRECISION   D( * ), X( LDX, * )
        !            18: *     ..
        !            19: *
        !            20: *  Purpose
        !            21: *  =======
        !            22: *
        !            23: *  DLASCL2 performs a diagonal scaling on a vector:
        !            24: *    x <-- D * x
        !            25: *  where the diagonal matrix D is stored as a vector.
        !            26: *
        !            27: *  Eventually to be replaced by BLAS_dge_diag_scale in the new BLAS
        !            28: *  standard.
        !            29: *
        !            30: *  Arguments
        !            31: *  =========
        !            32: *
        !            33: *     M       (input) INTEGER
        !            34: *     The number of rows of D and X. M >= 0.
        !            35: *
        !            36: *     N       (input) INTEGER
        !            37: *     The number of columns of D and X. N >= 0.
        !            38: *
        !            39: *     D       (input) DOUBLE PRECISION array, length M
        !            40: *     Diagonal matrix D, stored as a vector of length M.
        !            41: *
        !            42: *     X       (input/output) DOUBLE PRECISION array, dimension (LDX,N)
        !            43: *     On entry, the vector X to be scaled by D.
        !            44: *     On exit, the scaled vector.
        !            45: *
        !            46: *     LDX     (input) INTEGER
        !            47: *     The leading dimension of the vector X. LDX >= 0.
        !            48: *
        !            49: *  =====================================================================
        !            50: *
        !            51: *     .. Local Scalars ..
        !            52:       INTEGER            I, J
        !            53: *     ..
        !            54: *     .. Executable Statements ..
        !            55: *
        !            56:       DO J = 1, N
        !            57:          DO I = 1, M
        !            58:             X( I, J ) = X( I, J ) * D( I )
        !            59:          END DO
        !            60:       END DO
        !            61: 
        !            62:       RETURN
        !            63:       END