NAME

dlargv - generate a vector of real plane rotations, determined by elements of the real vectors x and y

SYNOPSIS

SUBROUTINE DLARGV( N, X, INCX, Y, INCY, C, INCC )

INTEGER INCC, INCX, INCY, N

DOUBLE PRECISION C( ∗ ), X( ∗ ), Y( ∗ )

#include <sunperf.h>

void dlargv(int n, double ∗dx, int incx, double ∗dy, int incy, double ∗dc, int incc) ;

PURPOSE

DLARGV generates a vector of real plane rotations, determined by elements of the real vectors x and y. For i = 1,2,...,n
 
   (  c(i)  s(i) ) ( x(i) ) = ( a(i) )
   ( -s(i)  c(i) ) ( y(i) ) = (   0  )
 

ARGUMENTS

N (input) INTEGER
The number of plane rotations to be generated.

X (input/output) DOUBLE PRECISION array,
dimension (1+(N-1)∗INCX) On entry, the vector x. On exit, x(i) is overwritten by a(i), for i = 1,...,n.

INCX (input) INTEGER
The increment between elements of X. INCX > 0.

Y (input/output) DOUBLE PRECISION array,
dimension (1+(N-1)∗INCY) On entry, the vector y. On exit, the sines of the plane rotations.

INCY (input) INTEGER
The increment between elements of Y. INCY > 0.

C (output) DOUBLE PRECISION array, dimension (1+(N-1)∗INCC)
The cosines of the plane rotations.

INCC (input) INTEGER
The increment between elements of C. INCC > 0.

SunOS 5.0  —  Last change: 10 Dec 1998