---
name: "dlar2v"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/dlar2v/3lapack"
---

# dlar2v(3lapack)

applies a vector of real plane rotations from both sides to a sequence of 2-by-2 real symmetric matrices, defined by the elements of the vectors x, y and z

## NAME

DLAR2V - applies a vector of real plane rotations from both sides to a sequence of 2-by-2 real symmetric matrices, defined by the elements of the vectors x, y and z

## SYNOPSIS

- SUBROUTINE DLAR2V(

  N, X, Y, Z, INCX, C, S, INCC )

- INTEGER

  INCC, INCX, N

- DOUBLE

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

## PURPOSE

DLAR2V applies a vector of real plane rotations from both sides to a sequence of 2-by-2 real symmetric matrices, defined by the elements of the vectors x, y and z. For i = 1,2,...,n\
    ( x(i)  z(i) ) := (  c(i)  s(i) ) ( x(i)  z(i) ) ( c(i) -s(i) )\
    ( z(i)  y(i) )    ( -s(i)  c(i) ) ( z(i)  y(i) ) ( s(i)  c(i) )

## ARGUMENTS

- N (input) INTEGER

  The number of plane rotations to be applied.

- X (input/output) DOUBLE PRECISION array,

  dimension (1+(N-1)\*INCX) The vector x.

- Y (input/output) DOUBLE PRECISION array,

  dimension (1+(N-1)\*INCX) The vector y.

- Z (input/output) DOUBLE PRECISION array,

  dimension (1+(N-1)\*INCX) The vector z.

- INCX (input) INTEGER

  The increment between elements of X, Y and Z. INCX \> 0.

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

  The cosines of the plane rotations.

- S (input) DOUBLE PRECISION array, dimension (1+(N-1)\*INCC)

  The sines of the plane rotations.

- INCC (input) INTEGER

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