CXML

LAPACK version 3.0

clar2v(3)

PURPOSE

CLAR2V - applie a vector of complex plane rotations with real cosines from both sides to a sequence of 2-by-2 complex Hermitian matrices,

SYNTAX

SUBROUTINE CLAR2V( N, X, Y, Z, INCX, C, S, INCC ) INTEGER INCC, INCX, N REAL C( * ) COMPLEX S( * ), X( * ), Y( * ), Z( * )

DESCRIPTION

CLAR2V applies a vector of complex plane rotations with real cosines from both sides to a sequence of 2-by-2 complex Hermitian matrices, defined by the elements of the vectors x, y and z. For i = 1,2,...,n ( x(i) z(i) ) := ( conjg(z(i)) y(i) ) ( c(i) conjg(s(i)) ) ( x(i) z(i) ) ( c(i) -conjg(s(i)) ) ( -s(i) c(i) ) ( conjg(z(i)) y(i) ) ( s(i) c(i) )

ARGUMENTS

N (input) INTEGER The number of plane rotations to be applied. X (input/output) COMPLEX array, dimension (1+(N-1)*INCX) The vector x; the elements of x are assumed to be real. Y (input/output) COMPLEX array, dimension (1+(N-1)*INCX) The vector y; the elements of y are assumed to be real. Z (input/output) COMPLEX 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) REAL array, dimension (1+(N-1)*INCC) The cosines of the plane rotations. S (input) COMPLEX 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.

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