crot(3)

Usage

Functions/Subroutines

subroutine crot (n, cx, incx, cy, incy, c, s)
CROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Function/Subroutine Documentation

subroutine crot (integer n, complex, dimension( * ) cx, integer incx, complex, dimension( * ) cy, integer incy, real c, complex s)

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

Purpose:

!>
!> CROT 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 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 CX.  INCX <> 0.
!>

CY

!>          CY is COMPLEX 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 REAL
!>

S

!>          S is COMPLEX
!>          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.

Definition at line 102 of file crot.f.

Releases

14 releases since Debian 1.3 (Bo); the text changed 11 times.