LAPACK

NAME¶

lacrt - lacrt: apply plane rotation (unused?)

SYNOPSIS¶

Functions¶

subroutine clacrt (n, cx, incx, cy, incy, c, s)
CLACRT performs a linear transformation of a pair of complex vectors. subroutine zlacrt (n, cx, incx, cy, incy, c, s)
ZLACRT performs a linear transformation of a pair of complex vectors.

Detailed Description¶

Function Documentation¶

subroutine clacrt (integer n, complex, dimension( * ) cx, integer incx, complex, dimension( * ) cy, integer incy, complex c, complex s)¶

CLACRT performs a linear transformation of a pair of complex vectors.

Purpose:

!>
!> CLACRT performs the operation
!>
!>    (  c  s )( x )  ==> ( x )
!>    ( -s  c )( y )      ( y )
!>
!> where c and s are complex and the vectors x and y are complex.
!>

Parameters

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

!>          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 is COMPLEX array, dimension (N)
!>          On input, the vector y.
!>          On output, CY is overwritten with -s*x + c*y.
!>

INCY

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

!>          C is COMPLEX
!>

!>          S is COMPLEX
!>          C and S define the matrix
!>             [  C   S  ].
!>             [ -S   C  ]
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

subroutine zlacrt (integer n, complex16, dimension( ) cx, integer incx, complex16, dimension( ) cy, integer incy, complex16 c, complex16 s)¶

ZLACRT performs a linear transformation of a pair of complex vectors.