dlar2v.f(3)

NAME
dlar2v.f -

SYNOPSIS

  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 (integerN, double precision, dimension( * )X, double precision, dimension( * )Y, double precision, dimension( * )Z, integerINCX, double precision, dimension( * )C, double precision, dimension( * )S, integerINCC)

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.

Date:
    September 2012

Definition at line 111 of file dlar2v.f.

Author

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