# slasq4.f(3) [centos man page]

```slasq4.f(3)							      LAPACK							       slasq4.f(3)

NAME
slasq4.f -

SYNOPSIS
Functions/Subroutines
subroutine slasq4 (I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G)
SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.

Function/Subroutine Documentation
subroutine slasq4 (integerI0, integerN0, real, dimension( * )Z, integerPP, integerN0IN, realDMIN, realDMIN1, realDMIN2, realDN, realDN1,
realDN2, realTAU, integerTTYPE, realG)
SLASQ4 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.

Purpose:

SLASQ4 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 REAL 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 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(N)

DN1

DN1 is REAL
d(N-1)

DN2

DN2 is REAL
d(N-2)

TAU

TAU is REAL
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 SLASQ4.

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
September 2012

Further Details:

CNST1 = 9/16

Definition at line 151 of file slasq4.f.

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

Version 3.4.2							  Tue Sep 25 2012						       slasq4.f(3)```

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```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 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.

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 computes an approximation to the smallest eigenvalue using values of d from the previous transform. Used by sbdsqr.

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

NAG Ltd.

Date:
September 2012

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 3.4.2							  Tue Sep 25 2012						       dlasq4.f(3)```
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