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### zdrot: plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex

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ZDROT- plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex## SYNOPSIS

SUBROUTINE ZDROT( N, CX, INCX, CY, INCY, C, S ) INTEGER INCX, INCY, N DOUBLE PRECISION C, S COMPLEX*16 CX( * ), CY( * )## PURPOSE

Applies a plane rotation, where the cos and sin (c and s) are real and the vectors cx and cy are complex. jack dongarra, linpack, 3/11/78.## ARGUMENTS

N (input) INTEGER On entry, N specifies the order of the vectors cx and cy. N must be at least zero. Unchanged on exit. CX (input) COMPLEX*16 array, dimension at least ( 1 + ( N - 1 )*abs( INCX ) ). Before entry, the incremented array CX must contain the n element vector cx. On exit, CX is overwritten by the updated vector cx. INCX (input) INTEGER On entry, INCX specifies the increment for the elements of CX. INCX must not be zero. Unchanged on exit. CY (input) COMPLEX*16 array, dimension at least ( 1 + ( N - 1 )*abs( INCY ) ). Before entry, the incremented array CY must contain the n element vector cy. On exit, CY is overwritten by the updated vector cy. INCY (input) INTEGER On entry, INCY specifies the increment for the elements of CY. INCY must not be zero. Unchanged on exit. C (input) DOUBLE PRECISION On entry, C specifies the cosine, cos. Unchanged on exit. S (input) DOUBLE PRECISION On entry, S specifies the sine, sin. Unchanged on exit. October 2006 ZDROT(3)

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