---
name: "zdrot"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/zdrot/3lapack"
---

# zdrot(3lapack)

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

## NAME

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.