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authorjofret2009-04-28 07:17:00 +0000
committerjofret2009-04-28 07:17:00 +0000
commit8c8d2f518968ce7057eec6aa5cd5aec8faab861a (patch)
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parent9f652ffc16a310ac6641a9766c5b9e2671e0e9cb (diff)
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Moving lapack to right place
Diffstat (limited to 'src/lib/lapack/zrot.f')
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diff --git a/src/lib/lapack/zrot.f b/src/lib/lapack/zrot.f
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- SUBROUTINE ZROT( N, CX, INCX, CY, INCY, C, S )
-*
-* -- LAPACK auxiliary routine (version 3.1) --
-* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
-* November 2006
-*
-* .. Scalar Arguments ..
- INTEGER INCX, INCY, N
- DOUBLE PRECISION C
- COMPLEX*16 S
-* ..
-* .. Array Arguments ..
- COMPLEX*16 CX( * ), CY( * )
-* ..
-*
-* Purpose
-* =======
-*
-* ZROT applies a plane rotation, where the cos (C) is real and the
-* sin (S) is complex, and the vectors CX and CY are complex.
-*
-* Arguments
-* =========
-*
-* N (input) INTEGER
-* The number of elements in the vectors CX and CY.
-*
-* CX (input/output) COMPLEX*16 array, dimension (N)
-* On input, the vector X.
-* On output, CX is overwritten with C*X + S*Y.
-*
-* INCX (input) INTEGER
-* The increment between successive values of CY. INCX <> 0.
-*
-* CY (input/output) COMPLEX*16 array, dimension (N)
-* On input, the vector Y.
-* On output, CY is overwritten with -CONJG(S)*X + C*Y.
-*
-* INCY (input) INTEGER
-* The increment between successive values of CY. INCX <> 0.
-*
-* C (input) DOUBLE PRECISION
-* S (input) COMPLEX*16
-* C and S define a rotation
-* [ C S ]
-* [ -conjg(S) C ]
-* where C*C + S*CONJG(S) = 1.0.
-*
-* =====================================================================
-*
-* .. Local Scalars ..
- INTEGER I, IX, IY
- COMPLEX*16 STEMP
-* ..
-* .. Intrinsic Functions ..
- INTRINSIC DCONJG
-* ..
-* .. Executable Statements ..
-*
- IF( N.LE.0 )
- $ RETURN
- IF( INCX.EQ.1 .AND. INCY.EQ.1 )
- $ GO TO 20
-*
-* Code for unequal increments or equal increments not equal to 1
-*
- IX = 1
- IY = 1
- IF( INCX.LT.0 )
- $ IX = ( -N+1 )*INCX + 1
- IF( INCY.LT.0 )
- $ IY = ( -N+1 )*INCY + 1
- DO 10 I = 1, N
- STEMP = C*CX( IX ) + S*CY( IY )
- CY( IY ) = C*CY( IY ) - DCONJG( S )*CX( IX )
- CX( IX ) = STEMP
- IX = IX + INCX
- IY = IY + INCY
- 10 CONTINUE
- RETURN
-*
-* Code for both increments equal to 1
-*
- 20 CONTINUE
- DO 30 I = 1, N
- STEMP = C*CX( I ) + S*CY( I )
- CY( I ) = C*CY( I ) - DCONJG( S )*CX( I )
- CX( I ) = STEMP
- 30 CONTINUE
- RETURN
- END