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

# dlargv(3lapack)

generates a vector of real plane rotations, determined by elements of the real vectors x and y

## NAME

DLARGV - generates a vector of real plane rotations, determined by elements of the real vectors x and y

## SYNOPSIS

- SUBROUTINE DLARGV(

  N, X, INCX, Y, INCY, C, INCC )

- INTEGER

  INCC, INCX, INCY, N

- DOUBLE

  PRECISION C( \* ), X( \* ), Y( \* )

## PURPOSE

DLARGV generates a vector of real plane rotations, determined by elements of the real vectors x and y. For i = 1,2,...,n\
    (  c(i)  s(i) ) ( x(i) ) = ( a(i) )\
\
    ( -s(i)  c(i) ) ( y(i) ) = (   0  )\

## ARGUMENTS

- N (input) INTEGER

  The number of plane rotations to be generated.

- X (input/output) DOUBLE PRECISION array,

  dimension (1+(N-1)\*INCX) On entry, the vector x. On exit, x(i) is overwritten by a(i), for i = 1,...,n.

- INCX (input) INTEGER

  The increment between elements of X. INCX \> 0.

- Y (input/output) DOUBLE PRECISION array,

  dimension (1+(N-1)\*INCY) On entry, the vector y. On exit, the sines of the plane rotations.

- INCY (input) INTEGER

  The increment between elements of Y. INCY \> 0.

- C (output) DOUBLE PRECISION array, dimension (1+(N-1)\*INCC)

  The cosines of the plane rotations.

- INCC (input) INTEGER

  The increment between elements of C. INCC \> 0.