NAME

drotm - Apply a Gentleman’s modified Given’s rotation constructed by DROTMG. 

SYNOPSIS

SUBROUTINE DROTM (N, X, INCY, Y, INCY, PARAM)

INTEGER INCX, INCY, N

DOUBLE PRECISION    PARAM(5), X( ∗ ), Y( ∗ )

#include <sunperf.h>

void drotm(int n, double ∗dx, int incx, double ∗dy, int incy, double ∗dparam) ;

PURPOSE

DROTM - Apply a Given’s rotation constructed by DROTMG. 
 

PARAMETERS

N - INTEGER. 
On entry, N specifies the number of elements in the vector.  N must be at least one for the subroutine to have any visible effect.  Unchanged on exit.

X - DOUBLE PRECISION array of DIMENSION at least
( 1 + ( n - 1 )∗abs( INCX ) ). Before entry, the incremented array X must contain the vector x. Unchanged on exit.

INCX - INTEGER. 
On entry, INCX specifies the increment for the elements of X. INCX must not be zero. Unchanged on exit.

Y - DOUBLE PRECISION array of DIMENSION at least
( 1 + ( m - 1 )∗abs( INCY ) ). On entry, the incremented array Y must contain the vector y. On exit, Y is overwritten by the updated vector y.

INCY - INTEGER. 
On entry, INCY specifies the increment for the elements of Y. INCY must not be zero. Unchanged on exit.

PARAM - DOUBLE PRECISION. 
On entry, the rotation values constructed by DROTMG.  Unchanged on exit.

SunOS 5.0  —  Last change: 10 Dec 1998