Man page - lasq6(3)

Packages contains this manual

Manual

lasq6

NAME
SYNOPSIS
Functions
Detailed Description
Function Documentation
subroutine dlasq6 (integer i0, integer n0, double precision, dimension( * )z, integer pp, double precision dmin, double precision dmin1, doubleprecision dmin2, double precision dn, double precision dnm1, doubleprecision dnm2)
subroutine slasq6 (integer i0, integer n0, real, dimension( * ) z, integerpp, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2)
Author

NAME

lasq6 - lasq6: dqds step

SYNOPSIS

Functions

subroutine dlasq6 (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2)
DLASQ6
computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.
subroutine slasq6 (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2)
SLASQ6
computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Detailed Description

Function Documentation

subroutine dlasq6 (integer i0, integer n0, double precision, dimension( * )z, integer pp, double precision dmin, double precision dmin1, doubleprecision dmin2, double precision dn, double precision dnm1, doubleprecision dnm2)

DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Purpose:

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

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.

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).

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

subroutine slasq6 (integer i0, integer n0, real, dimension( * ) z, integerpp, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2)

SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Purpose:

SLASQ6 computes one dqd (shift equal to zero) transform in
ping-pong form, with protection against underflow and overflow.

Parameters

I0

I0 is INTEGER
First index.

N0

N0 is INTEGER
Last index.

Z

Z is REAL 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.

DMIN

DMIN is REAL
Minimum value of d.

DMIN1

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

DMIN2

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

DN

DN is REAL
d(N0), the last value of d.

DNM1

DNM1 is REAL
d(N0-1).

DNM2

DNM2 is REAL
d(N0-2).

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Author

Generated automatically by Doxygen for LAPACK from the source code.