LAPACK  3.6.1 LAPACK: Linear Algebra PACKage
 subroutine drot ( integer N, double precision, dimension(*) DX, integer INCX, double precision, dimension(*) DY, integer INCY, double precision C, double precision S )

DROT

Purpose:
`    DROT applies a plane rotation.`
Date
November 2011
Further Details:
```     jack dongarra, linpack, 3/11/78.
modified 12/3/93, array(1) declarations changed to array(*)```

Definition at line 53 of file drot.f.

53 *
54 * -- Reference BLAS level1 routine (version 3.4.0) --
55 * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
56 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
57 * November 2011
58 *
59 * .. Scalar Arguments ..
60  DOUBLE PRECISION c,s
61  INTEGER incx,incy,n
62 * ..
63 * .. Array Arguments ..
64  DOUBLE PRECISION dx(*),dy(*)
65 * ..
66 *
67 * =====================================================================
68 *
69 * .. Local Scalars ..
70  DOUBLE PRECISION dtemp
71  INTEGER i,ix,iy
72 * ..
73  IF (n.LE.0) RETURN
74  IF (incx.EQ.1 .AND. incy.EQ.1) THEN
75 *
76 * code for both increments equal to 1
77 *
78  DO i = 1,n
79  dtemp = c*dx(i) + s*dy(i)
80  dy(i) = c*dy(i) - s*dx(i)
81  dx(i) = dtemp
82  END DO
83  ELSE
84 *
85 * code for unequal increments or equal increments not equal
86 * to 1
87 *
88  ix = 1
89  iy = 1
90  IF (incx.LT.0) ix = (-n+1)*incx + 1
91  IF (incy.LT.0) iy = (-n+1)*incy + 1
92  DO i = 1,n
93  dtemp = c*dx(ix) + s*dy(iy)
94  dy(iy) = c*dy(iy) - s*dx(ix)
95  dx(ix) = dtemp
96  ix = ix + incx
97  iy = iy + incy
98  END DO
99  END IF
100  RETURN

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