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drotmg.f(3)				      LAPACK				      drotmg.f(3)

NAME
       drotmg.f -

SYNOPSIS
   Functions/Subroutines
       subroutine drotmg (DD1, DD2, DX1, DY1, DPARAM)
	   DROTMG

Function/Subroutine Documentation
   subroutine drotmg (double precisionDD1, double precisionDD2, double precisionDX1, double
       precisionDY1, double precision, dimension(5)DPARAM)
       DROTMG Purpose:

	       CONSTRUCT THE MODIFIED GIVENS TRANSFORMATION MATRIX H WHICH ZEROS
	       THE SECOND COMPONENT OF THE 2-VECTOR  (DSQRT(DD1)*DX1,DSQRT(DD2)*>    DY2)**T.
	       WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS..

	       DFLAG=-1.D0     DFLAG=0.D0	 DFLAG=1.D0	DFLAG=-2.D0

		 (DH11	DH12)	 (1.D0	DH12)	 (DH11	1.D0)	 (1.D0	0.D0)
	       H=(	    )	 (	    )	 (	    )	 (	    )
		 (DH21	DH22),	 (DH21	1.D0),	 (-1.D0 DH22),	 (0.D0	1.D0).
	       LOCATIONS 2-4 OF DPARAM CONTAIN DH11, DH21, DH12, AND DH22
	       RESPECTIVELY. (VALUES OF 1.D0, -1.D0, OR 0.D0 IMPLIED BY THE
	       VALUE OF DPARAM(1) ARE NOT STORED IN DPARAM.)

	       THE VALUES OF GAMSQ AND RGAMSQ SET IN THE DATA STATEMENT MAY BE
	       INEXACT.  THIS IS OK AS THEY ARE ONLY USED FOR TESTING THE SIZE
	       OF DD1 AND DD2.	ALL ACTUAL SCALING OF DATA IS DONE USING GAM.

       Parameters:
	   DD1

		     DD1 is DOUBLE PRECISION

	   DD2

		     DD2 is DOUBLE PRECISION

	   DX1

		     DX1 is DOUBLE PRECISION

	   DY1

		     DY1 is DOUBLE PRECISION

	   DPARAM

		     DPARAM is DOUBLE PRECISION array, dimension 5
		DPARAM(1)=DFLAG
		DPARAM(2)=DH11
		DPARAM(3)=DH21
		DPARAM(4)=DH12
		DPARAM(5)=DH22

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 91 of file drotmg.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      drotmg.f(3)
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