LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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dlar2v.f File Reference

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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. More...
 

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.

Download DLAR2V + dependencies [TGZ] [ZIP] [TXT]
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
[in]N
          N is INTEGER
          The number of plane rotations to be applied.
[in,out]X
          X is DOUBLE PRECISION array,
                         dimension (1+(N-1)*INCX)
          The vector x.
[in,out]Y
          Y is DOUBLE PRECISION array,
                         dimension (1+(N-1)*INCX)
          The vector y.
[in,out]Z
          Z is DOUBLE PRECISION array,
                         dimension (1+(N-1)*INCX)
          The vector z.
[in]INCX
          INCX is INTEGER
          The increment between elements of X, Y and Z. INCX > 0.
[in]C
          C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
          The cosines of the plane rotations.
[in]S
          S is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
          The sines of the plane rotations.
[in]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.
Date
September 2012

Definition at line 111 of file dlar2v.f.

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