Annotation of rpl/lapack/lapack/dlartv.f, revision 1.8
1.8 ! bertrand 1: *> \brief \b DLARTV
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: *> \htmlonly
! 9: *> Download DLARTV + dependencies
! 10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlartv.f">
! 11: *> [TGZ]</a>
! 12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlartv.f">
! 13: *> [ZIP]</a>
! 14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlartv.f">
! 15: *> [TXT]</a>
! 16: *> \endhtmlonly
! 17: *
! 18: * Definition:
! 19: * ===========
! 20: *
! 21: * SUBROUTINE DLARTV( N, X, INCX, Y, INCY, C, S, INCC )
! 22: *
! 23: * .. Scalar Arguments ..
! 24: * INTEGER INCC, INCX, INCY, N
! 25: * ..
! 26: * .. Array Arguments ..
! 27: * DOUBLE PRECISION C( * ), S( * ), X( * ), Y( * )
! 28: * ..
! 29: *
! 30: *
! 31: *> \par Purpose:
! 32: * =============
! 33: *>
! 34: *> \verbatim
! 35: *>
! 36: *> DLARTV applies a vector of real plane rotations to elements of the
! 37: *> real vectors x and y. For i = 1,2,...,n
! 38: *>
! 39: *> ( x(i) ) := ( c(i) s(i) ) ( x(i) )
! 40: *> ( y(i) ) ( -s(i) c(i) ) ( y(i) )
! 41: *> \endverbatim
! 42: *
! 43: * Arguments:
! 44: * ==========
! 45: *
! 46: *> \param[in] N
! 47: *> \verbatim
! 48: *> N is INTEGER
! 49: *> The number of plane rotations to be applied.
! 50: *> \endverbatim
! 51: *>
! 52: *> \param[in,out] X
! 53: *> \verbatim
! 54: *> X is DOUBLE PRECISION array,
! 55: *> dimension (1+(N-1)*INCX)
! 56: *> The vector x.
! 57: *> \endverbatim
! 58: *>
! 59: *> \param[in] INCX
! 60: *> \verbatim
! 61: *> INCX is INTEGER
! 62: *> The increment between elements of X. INCX > 0.
! 63: *> \endverbatim
! 64: *>
! 65: *> \param[in,out] Y
! 66: *> \verbatim
! 67: *> Y is DOUBLE PRECISION array,
! 68: *> dimension (1+(N-1)*INCY)
! 69: *> The vector y.
! 70: *> \endverbatim
! 71: *>
! 72: *> \param[in] INCY
! 73: *> \verbatim
! 74: *> INCY is INTEGER
! 75: *> The increment between elements of Y. INCY > 0.
! 76: *> \endverbatim
! 77: *>
! 78: *> \param[in] C
! 79: *> \verbatim
! 80: *> C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
! 81: *> The cosines of the plane rotations.
! 82: *> \endverbatim
! 83: *>
! 84: *> \param[in] S
! 85: *> \verbatim
! 86: *> S is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
! 87: *> The sines of the plane rotations.
! 88: *> \endverbatim
! 89: *>
! 90: *> \param[in] INCC
! 91: *> \verbatim
! 92: *> INCC is INTEGER
! 93: *> The increment between elements of C and S. INCC > 0.
! 94: *> \endverbatim
! 95: *
! 96: * Authors:
! 97: * ========
! 98: *
! 99: *> \author Univ. of Tennessee
! 100: *> \author Univ. of California Berkeley
! 101: *> \author Univ. of Colorado Denver
! 102: *> \author NAG Ltd.
! 103: *
! 104: *> \date November 2011
! 105: *
! 106: *> \ingroup doubleOTHERauxiliary
! 107: *
! 108: * =====================================================================
1.1 bertrand 109: SUBROUTINE DLARTV( N, X, INCX, Y, INCY, C, S, INCC )
110: *
1.8 ! bertrand 111: * -- LAPACK auxiliary routine (version 3.4.0) --
1.1 bertrand 112: * -- LAPACK is a software package provided by Univ. of Tennessee, --
113: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.8 ! bertrand 114: * November 2011
1.1 bertrand 115: *
116: * .. Scalar Arguments ..
117: INTEGER INCC, INCX, INCY, N
118: * ..
119: * .. Array Arguments ..
120: DOUBLE PRECISION C( * ), S( * ), X( * ), Y( * )
121: * ..
122: *
123: * =====================================================================
124: *
125: * .. Local Scalars ..
126: INTEGER I, IC, IX, IY
127: DOUBLE PRECISION XI, YI
128: * ..
129: * .. Executable Statements ..
130: *
131: IX = 1
132: IY = 1
133: IC = 1
134: DO 10 I = 1, N
135: XI = X( IX )
136: YI = Y( IY )
137: X( IX ) = C( IC )*XI + S( IC )*YI
138: Y( IY ) = C( IC )*YI - S( IC )*XI
139: IX = IX + INCX
140: IY = IY + INCY
141: IC = IC + INCC
142: 10 CONTINUE
143: RETURN
144: *
145: * End of DLARTV
146: *
147: END
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