zrot.f (3)

Functions/Subroutines

subroutine zrot (N, CX, INCX, CY, INCY, C, S)

ZROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

subroutine zrot (integerN, complex*16, dimension( * )CX, integerINCX, complex*16, dimension( * )CY, integerINCY, double precisionC, complex*16S)

ZROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

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.

Parameters:

N

          N is INTEGER
          The number of elements in the vectors CX and CY.

CX

          CX is COMPLEX*16 array, dimension (N)
          On input, the vector X.
          On output, CX is overwritten with C*X + S*Y.

INCX

          INCX is INTEGER
          The increment between successive values of CY.  INCX <> 0.

CY

          CY is COMPLEX*16 array, dimension (N)
          On input, the vector Y.
          On output, CY is overwritten with -CONJG(S)*X + C*Y.

INCY

          INCY is INTEGER
          The increment between successive values of CY.  INCX <> 0.

C

          C is DOUBLE PRECISION

S

          S is COMPLEX*16
          C and S define a rotation
             [  C          S  ]
             [ -conjg(S)   C  ]
          where C*C + S*CONJG(S) = 1.0.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 104 of file zrot.f.

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