dlasq6(l) [redhat man page]

DLASQ6(l)								 )								 DLASQ6(l)

NAME

       DLASQ6 - compute one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow

SYNOPSIS

       SUBROUTINE DLASQ6( I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 )

	   INTEGER	  I0, N0, PP

	   DOUBLE	  PRECISION DMIN, DMIN1, DMIN2, DN, DNM1, DNM2

	   DOUBLE	  PRECISION Z( * )

PURPOSE

       DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.

ARGUMENTS

       I0    (input) INTEGER
	     First index.

       N0    (input) INTEGER
	     Last index.

       Z     (input) DOUBLE PRECISION array, dimension ( 4*N )
	     Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument.

       PP    (input) INTEGER
	     PP=0 for ping, PP=1 for pong.

       DMIN  (output) DOUBLE PRECISION
	     Minimum value of d.

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

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

       DN    (output) DOUBLE PRECISION
	     d(N0), the last value of d.

       DNM1  (output) DOUBLE PRECISION
	     d(N0-1).

       DNM2  (output) DOUBLE PRECISION
	     d(N0-2).

LAPACK version 3.0						   15 June 2000 							 DLASQ6(l)

dlasq5.f(3)							      LAPACK							       dlasq5.f(3)

NAME

       dlasq5.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS)
	   DLASQ5

Function/Subroutine Documentation
   subroutine dlasq5 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionTAU, double precisionSIGMA, double
       precisionDMIN, double precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDNM1, double precisionDNM2, logicalIEEE,
       double precisionEPS)
       DLASQ5

       Purpose:

	    DLASQ5 computes one dqds transform in ping-pong form, one
	    version for IEEE machines another for non IEEE machines.

       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. EMIN is stored in Z(4*N0) to avoid
		   an extra argument.

	   PP

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

	   TAU

		     TAU is DOUBLE PRECISION
		   This is the shift.

	   SIGMA

		     SIGMA is DOUBLE PRECISION
		   This is the accumulated shift up to this step.

	   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(N0), the last value of d.

	   DNM1

		     DNM1 is DOUBLE PRECISION
		   d(N0-1).

	   DNM2

		     DNM2 is DOUBLE PRECISION
		   d(N0-2).

	   IEEE

		     IEEE is LOGICAL
		   Flag for IEEE or non IEEE arithmetic.

	   EPS

		     EPS is DOUBLE PRECISION
		   This is the value of epsilon used.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   April 2012

       Definition at line 144 of file dlasq5.f.

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

Version 3.4.1							  Sun May 26 2013						       dlasq5.f(3)