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drotm(3P)		    Sun Performance Library		     drotm(3P)

NAME
       drotm  -	 Apply	a Gentleman's modified Given's rotation constructed by
       SROTMG.

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

       INTEGER N, INCX, INCY
       DOUBLE PRECISION X(*), Y(*), PARAM(*)

       SUBROUTINE DROTM_64(N, X, INCX, Y, INCY, PARAM)

       INTEGER*8 N, INCX, INCY
       DOUBLE PRECISION X(*), Y(*), PARAM(*)

   F95 INTERFACE
       SUBROUTINE ROTM([N], X, [INCX], Y, [INCY], PARAM)

       INTEGER :: N, INCX, INCY
       REAL(8), DIMENSION(:) :: X, Y, PARAM

       SUBROUTINE ROTM_64([N], X, [INCX], Y, [INCY], PARAM)

       INTEGER(8) :: N, INCX, INCY
       REAL(8), DIMENSION(:) :: X, Y, PARAM

   C INTERFACE
       #include <sunperf.h>

       void drotm(int n, double *x, int incx,  double  *y,  int	 incy,	double
		 *param);

       void  drotm_64(long n, double *x, long incx, double *y, long incy, dou‐
		 ble *param);

PURPOSE
       drotm Apply a Given's rotation constructed by SROTMG.

ARGUMENTS
       N (input)
		 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 (input/output)
		 ( 1 + ( n - 1 )*abs( INCX ) ).	  On  entry,  the  incremented
		 array	X must contain the vector x. On exit, X is overwritten
		 by the updated vector x.

       INCX (input)
		 On entry, INCX specifies the increment for the elements of X.
		 INCX must not be zero.	 Unchanged on exit.

       Y (input/output)
		 (  1  +  (  n - 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 (input)
		 On entry, INCY specifies the increment for the elements of Y.
		 INCY must not be zero.	 Unchanged on exit.

       PARAM (input)
		 On  entry,  the  rotation  values  constructed	  by   SROTMG.
		 Unchanged on exit.

				  6 Mar 2009			     drotm(3P)
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