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Annotation of rpl/lapack/lapack/zlascl2.f, revision 1.11

1.8       bertrand    1: *> \brief \b ZLASCL2 performs diagonal scaling on a vector.
1.5       bertrand    2: *
                      3: *  =========== DOCUMENTATION ===========
                      4: *
                      5: * Online html documentation available at 
                      6: *            http://www.netlib.org/lapack/explore-html/ 
                      7: *
                      8: *> \htmlonly
                      9: *> Download ZLASCL2 + dependencies 
                     10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlascl2.f"> 
                     11: *> [TGZ]</a> 
                     12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlascl2.f"> 
                     13: *> [ZIP]</a> 
                     14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlascl2.f"> 
                     15: *> [TXT]</a>
                     16: *> \endhtmlonly 
                     17: *
                     18: *  Definition:
                     19: *  ===========
                     20: *
                     21: *       SUBROUTINE ZLASCL2 ( M, N, D, X, LDX )
                     22: * 
                     23: *       .. Scalar Arguments ..
                     24: *       INTEGER            M, N, LDX
                     25: *       ..
                     26: *       .. Array Arguments ..
                     27: *       DOUBLE PRECISION   D( * )
                     28: *       COMPLEX*16         X( LDX, * )
                     29: *       ..
                     30: *  
                     31: *
                     32: *> \par Purpose:
                     33: *  =============
                     34: *>
                     35: *> \verbatim
                     36: *>
                     37: *> ZLASCL2 performs a diagonal scaling on a vector:
                     38: *>   x <-- D * x
                     39: *> where the DOUBLE PRECISION diagonal matrix D is stored as a vector.
                     40: *>
                     41: *> Eventually to be replaced by BLAS_zge_diag_scale in the new BLAS
                     42: *> standard.
                     43: *> \endverbatim
                     44: *
                     45: *  Arguments:
                     46: *  ==========
                     47: *
                     48: *> \param[in] M
                     49: *> \verbatim
                     50: *>          M is INTEGER
                     51: *>     The number of rows of D and X. M >= 0.
                     52: *> \endverbatim
                     53: *>
                     54: *> \param[in] N
                     55: *> \verbatim
                     56: *>          N is INTEGER
1.11    ! bertrand   57: *>     The number of columns of X. N >= 0.
1.5       bertrand   58: *> \endverbatim
                     59: *>
                     60: *> \param[in] D
                     61: *> \verbatim
                     62: *>          D is DOUBLE PRECISION array, length M
                     63: *>     Diagonal matrix D, stored as a vector of length M.
                     64: *> \endverbatim
                     65: *>
                     66: *> \param[in,out] X
                     67: *> \verbatim
                     68: *>          X is COMPLEX*16 array, dimension (LDX,N)
                     69: *>     On entry, the vector X to be scaled by D.
                     70: *>     On exit, the scaled vector.
                     71: *> \endverbatim
                     72: *>
                     73: *> \param[in] LDX
                     74: *> \verbatim
                     75: *>          LDX is INTEGER
                     76: *>     The leading dimension of the vector X. LDX >= 0.
                     77: *> \endverbatim
                     78: *
                     79: *  Authors:
                     80: *  ========
                     81: *
                     82: *> \author Univ. of Tennessee 
                     83: *> \author Univ. of California Berkeley 
                     84: *> \author Univ. of Colorado Denver 
                     85: *> \author NAG Ltd. 
                     86: *
1.11    ! bertrand   87: *> \date November 2015
1.5       bertrand   88: *
                     89: *> \ingroup complex16OTHERcomputational
                     90: *
                     91: *  =====================================================================
1.1       bertrand   92:       SUBROUTINE ZLASCL2 ( M, N, D, X, LDX )
                     93: *
1.11    ! bertrand   94: *  -- LAPACK computational routine (version 3.6.0) --
1.5       bertrand   95: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
                     96: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.11    ! bertrand   97: *     November 2015
1.1       bertrand   98: *
                     99: *     .. Scalar Arguments ..
                    100:       INTEGER            M, N, LDX
                    101: *     ..
                    102: *     .. Array Arguments ..
                    103:       DOUBLE PRECISION   D( * )
                    104:       COMPLEX*16         X( LDX, * )
                    105: *     ..
                    106: *
                    107: *  =====================================================================
                    108: *
                    109: *     .. Local Scalars ..
                    110:       INTEGER            I, J
                    111: *     ..
                    112: *     .. Executable Statements ..
                    113: *
                    114:       DO J = 1, N
                    115:          DO I = 1, M
                    116:             X( I, J ) = X( I, J ) * D( I )
                    117:          END DO
                    118:       END DO
                    119: 
                    120:       RETURN
                    121:       END
                    122: