dlar2v.f(3)

Usage

Functions/Subroutines

subroutine dlar2v (n, x, y, z, incx, c, s, incc)
DLAR2V applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

Function/Subroutine Documentation

subroutine dlar2v (integer n, double precision, dimension( * ) x, double precision, dimension( * ) y, double precision, dimension( * ) z, integer incx, double precision, dimension( * ) c, double precision, dimension( * ) s, integer incc)

DLAR2V applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

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) )
!>

Parameters

N

!>          N is INTEGER
!>          The number of plane rotations to be applied.
!>

X

!>          X is DOUBLE PRECISION array,
!>                         dimension (1+(N-1)*INCX)
!>          The vector x.
!>

Y

!>          Y is DOUBLE PRECISION array,
!>                         dimension (1+(N-1)*INCX)
!>          The vector y.
!>

Z

!>          Z is DOUBLE PRECISION array,
!>                         dimension (1+(N-1)*INCX)
!>          The vector z.
!>

INCX

!>          INCX is INTEGER
!>          The increment between elements of X, Y and Z. INCX > 0.
!>

C

!>          C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
!>          The cosines of the plane rotations.
!>

S

!>          S is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
!>          The sines of the plane rotations.
!>

INCC

!>          INCC is INTEGER
!>          The increment between elements of C and S. INCC > 0.
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 109 of file dlar2v.f.

Releases

4 releases since Debian 7 (Wheezy); the text changed 3 times.

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Arch