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.