dlar2v-f(3)

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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