File:  [local] / rpl / lapack / lapack / zlartv.f
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Sat Aug 7 13:22:41 2010 UTC (13 years, 9 months ago) by bertrand
Branches: MAIN
CVS tags: HEAD
Mise à jour globale de Lapack 3.2.2.

    1:       SUBROUTINE ZLARTV( N, X, INCX, Y, INCY, C, S, INCC )
    2: *
    3: *  -- LAPACK auxiliary routine (version 3.2) --
    4: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
    5: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
    6: *     November 2006
    7: *
    8: *     .. Scalar Arguments ..
    9:       INTEGER            INCC, INCX, INCY, N
   10: *     ..
   11: *     .. Array Arguments ..
   12:       DOUBLE PRECISION   C( * )
   13:       COMPLEX*16         S( * ), X( * ), Y( * )
   14: *     ..
   15: *
   16: *  Purpose
   17: *  =======
   18: *
   19: *  ZLARTV applies a vector of complex plane rotations with real cosines
   20: *  to elements of the complex vectors x and y. For i = 1,2,...,n
   21: *
   22: *     ( x(i) ) := (        c(i)   s(i) ) ( x(i) )
   23: *     ( y(i) )    ( -conjg(s(i))  c(i) ) ( y(i) )
   24: *
   25: *  Arguments
   26: *  =========
   27: *
   28: *  N       (input) INTEGER
   29: *          The number of plane rotations to be applied.
   30: *
   31: *  X       (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCX)
   32: *          The vector x.
   33: *
   34: *  INCX    (input) INTEGER
   35: *          The increment between elements of X. INCX > 0.
   36: *
   37: *  Y       (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCY)
   38: *          The vector y.
   39: *
   40: *  INCY    (input) INTEGER
   41: *          The increment between elements of Y. INCY > 0.
   42: *
   43: *  C       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
   44: *          The cosines of the plane rotations.
   45: *
   46: *  S       (input) COMPLEX*16 array, dimension (1+(N-1)*INCC)
   47: *          The sines of the plane rotations.
   48: *
   49: *  INCC    (input) INTEGER
   50: *          The increment between elements of C and S. INCC > 0.
   51: *
   52: *  =====================================================================
   53: *
   54: *     .. Local Scalars ..
   55:       INTEGER            I, IC, IX, IY
   56:       COMPLEX*16         XI, YI
   57: *     ..
   58: *     .. Intrinsic Functions ..
   59:       INTRINSIC          DCONJG
   60: *     ..
   61: *     .. Executable Statements ..
   62: *
   63:       IX = 1
   64:       IY = 1
   65:       IC = 1
   66:       DO 10 I = 1, N
   67:          XI = X( IX )
   68:          YI = Y( IY )
   69:          X( IX ) = C( IC )*XI + S( IC )*YI
   70:          Y( IY ) = C( IC )*YI - DCONJG( S( IC ) )*XI
   71:          IX = IX + INCX
   72:          IY = IY + INCY
   73:          IC = IC + INCC
   74:    10 CONTINUE
   75:       RETURN
   76: *
   77: *     End of ZLARTV
   78: *
   79:       END

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