drotmg(3) [centos man page]

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)

dlasq4.f(3)							      LAPACK							       dlasq4.f(3)

NAME

       dlasq4.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlasq4 (I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G)
	   DLASQ4

Function/Subroutine Documentation
   subroutine dlasq4 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, integerN0IN, double precisionDMIN, double
       precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDN1, double precisionDN2, double precisionTAU, integerTTYPE,
       double precisionG)
       DLASQ4

       Purpose:

	    DLASQ4 computes an approximation TAU to the smallest eigenvalue
	    using values of d from the previous transform.

       Parameters:
	   I0

		     I0 is INTEGER
		   First index.

	   N0

		     N0 is INTEGER
		   Last index.

	   Z

		     Z is DOUBLE PRECISION array, dimension ( 4*N )
		   Z holds the qd array.

	   PP

		     PP is INTEGER
		   PP=0 for ping, PP=1 for pong.

	   N0IN

		     N0IN is INTEGER
		   The value of N0 at start of EIGTEST.

	   DMIN

		     DMIN is DOUBLE PRECISION
		   Minimum value of d.

	   DMIN1

		     DMIN1 is DOUBLE PRECISION
		   Minimum value of d, excluding D( N0 ).

	   DMIN2

		     DMIN2 is DOUBLE PRECISION
		   Minimum value of d, excluding D( N0 ) and D( N0-1 ).

	   DN

		     DN is DOUBLE PRECISION
		   d(N)

	   DN1

		     DN1 is DOUBLE PRECISION
		   d(N-1)

	   DN2

		     DN2 is DOUBLE PRECISION
		   d(N-2)

	   TAU

		     TAU is DOUBLE PRECISION
		   This is the shift.

	   TTYPE

		     TTYPE is INTEGER
		   Shift type.

	   G

		     G is REAL
		   G is passed as an argument in order to save its value between
		   calls to DLASQ4.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

	     CNST1 = 9/16

       Definition at line 151 of file dlasq4.f.

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

Version 3.4.1							  Sun May 26 2013						       dlasq4.f(3)