Annotation of rpl/lapack/lapack/dlascl2.f, revision 1.5
1.5 ! bertrand 1: *> \brief \b DLASCL2
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: *> \htmlonly
! 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">
! 15: *> [TXT]</a>
! 16: *> \endhtmlonly
! 17: *
! 18: * Definition:
! 19: * ===========
! 20: *
! 21: * SUBROUTINE DLASCL2 ( M, N, D, X, LDX )
! 22: *
! 23: * .. Scalar Arguments ..
! 24: * INTEGER M, N, LDX
! 25: * ..
! 26: * .. Array Arguments ..
! 27: * DOUBLE PRECISION D( * ), X( LDX, * )
! 28: * ..
! 29: *
! 30: *
! 31: *> \par Purpose:
! 32: * =============
! 33: *>
! 34: *> \verbatim
! 35: *>
! 36: *> DLASCL2 performs a diagonal scaling on a vector:
! 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
! 56: *> The number of columns of D and X. N >= 0.
! 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)
! 68: *> On entry, the vector X to be scaled by D.
! 69: *> On exit, the scaled vector.
! 70: *> \endverbatim
! 71: *>
! 72: *> \param[in] LDX
! 73: *> \verbatim
! 74: *> LDX is INTEGER
! 75: *> The leading dimension of the vector X. LDX >= 0.
! 76: *> \endverbatim
! 77: *
! 78: * Authors:
! 79: * ========
! 80: *
! 81: *> \author Univ. of Tennessee
! 82: *> \author Univ. of California Berkeley
! 83: *> \author Univ. of Colorado Denver
! 84: *> \author NAG Ltd.
! 85: *
! 86: *> \date November 2011
! 87: *
! 88: *> \ingroup doubleOTHERcomputational
! 89: *
! 90: * =====================================================================
1.1 bertrand 91: SUBROUTINE DLASCL2 ( M, N, D, X, LDX )
92: *
1.5 ! bertrand 93: * -- LAPACK computational routine (version 3.4.0) --
! 94: * -- LAPACK is a software package provided by Univ. of Tennessee, --
! 95: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
! 96: * November 2011
1.1 bertrand 97: *
98: * .. Scalar Arguments ..
99: INTEGER M, N, LDX
100: * ..
101: * .. Array Arguments ..
102: DOUBLE PRECISION D( * ), X( LDX, * )
103: * ..
104: *
105: * =====================================================================
106: *
107: * .. Local Scalars ..
108: INTEGER I, J
109: * ..
110: * .. Executable Statements ..
111: *
112: DO J = 1, N
113: DO I = 1, M
114: X( I, J ) = X( I, J ) * D( I )
115: END DO
116: END DO
117:
118: RETURN
119: END
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