CXML

LAPACK version 3.0

zlacrt(3)

PURPOSE

ZLACRT - perform the operation ( c s )( x ) ==> ( x ) ( -s c )( y ) ( y ) where c and s are complex and the vectors x and y are complex

SYNTAX

SUBROUTINE ZLACRT( N, CX, INCX, CY, INCY, C, S ) INTEGER INCX, INCY, N COMPLEX*16 C, S COMPLEX*16 CX( * ), CY( * )

DESCRIPTION

ZLACRT 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.

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 CX. INCX <> 0. CY (input/output) COMPLEX*16 array, dimension (N) On input, the vector y. On output, CY is overwritten with -s*x + c*y. INCY (input) INTEGER The increment between successive values of CY. INCY <> 0. C (input) COMPLEX*16 S (input) COMPLEX*16 C and S define the matrix [ C S ]. [ -S C ]

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