drotmg man page on OpenIndiana

drotmg man page on OpenIndiana

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drotmg(3P)		    Sun Performance Library		    drotmg(3P)

NAME
       drotmg - Construct a Gentleman's modified Given's plane rotation

SYNOPSIS
       SUBROUTINE DROTMG(D1, D2, B1, B2, PARAM)

       DOUBLE PRECISION D1, D2, B1, B2
       DOUBLE PRECISION PARAM(*)

       SUBROUTINE DROTMG_64(D1, D2, B1, B2, PARAM)

       DOUBLE PRECISION D1, D2, B1, B2
       DOUBLE PRECISION PARAM(*)

   F95 INTERFACE
       SUBROUTINE ROTMG(D1, D2, B1, B2, PARAM)

       REAL(8) :: D1, D2, B1, B2
       REAL(8), DIMENSION(:) :: PARAM

       SUBROUTINE ROTMG_64(D1, D2, B1, B2, PARAM)

       REAL(8) :: D1, D2, B1, B2
       REAL(8), DIMENSION(:) :: PARAM

   C INTERFACE
       #include <sunperf.h>

       void drotmg(double d1, double d2, double b1, double b2, double *param);

       void  drotmg_64(double  d1,  double  d2,	 double	 b1, double b2, double
		 *param);

PURPOSE
       drotmg constructs the modified givens  transformation  matrix  h	 which
       zeros	  the	   second      component      of      the     2-vector
       (SQRT(D1)*B1,SQRT(D2)*B2)**T.

ARGUMENTS
       D1 (input/output)
		 On entry, the first diagonal entry in the H matrix.  On exit,
		 changed to reflect the effect of the transformation.

       D2 (input/output)
		 On  entry,  the  second  diagonal  entry in the H matrix.  On
		 exit, changed to reflect the effect of the transformation.

       B1 (input/output)
		 On entry, the first element of the  vector  to	 which	the  H
		 matrix is applied.  On exit, changed to reflect the effect of
		 the transformation.

       B2 (input)
		 On entry, the second element of the vector  to	 which	the  H
		 matrix is applied.  Unchanged on exit.

       PARAM (output)
		 On  exit,  PARAM(1) describes the form of the rotation matrix
		 H, and PARAM(2..5) contain the H matrix.

		 If PARAM(1) = -2 then H = I and no elements of PARAM are mod‐
		 ified.

		 If  PARAM(1)  =  -1  then  PARAM(2)  =	 h11,  PARAM(3) = h21,
		 PARAM(4) = h12, and PARAM(5) = h22.

		 If PARAM(1) = 0 then h11 = h22	 =  1,	PARAM(3)  =  h21,  and
		 PARAM(4) = h12.

		 If  PARAM(1)  = 1 then h12 = 1, h21 = -1, PARAM(2) = h11, and
		 PARAM(5) = h22.

				  14 Apr 2009			    drotmg(3P)

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