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.

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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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