org.netlib.lapack
Class DLAZQ4
java.lang.Object
org.netlib.lapack.DLAZQ4
public class DLAZQ4
- extends java.lang.Object
DLAZQ4 is a simplified interface to the JLAPACK routine dlazq4.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines. Using this interface also allows you
to omit offset and leading dimension arguments. However, because
of these conversions, these routines will be slower than the low
level ones. Following is the description from the original Fortran
source. Contact seymour@cs.utk.edu with any questions.
* ..
*
* Purpose
* =======
*
* DLAZQ4 computes an approximation TAU to the smallest eigenvalue
* using values of d from the previous transform.
*
* I0 (input) INTEGER
* First index.
*
* N0 (input) INTEGER
* Last index.
*
* Z (input) DOUBLE PRECISION array, dimension ( 4*N )
* Z holds the qd array.
*
* PP (input) INTEGER
* PP=0 for ping, PP=1 for pong.
*
* N0IN (input) INTEGER
* The value of N0 at start of EIGTEST.
*
* DMIN (input) DOUBLE PRECISION
* Minimum value of d.
*
* DMIN1 (input) DOUBLE PRECISION
* Minimum value of d, excluding D( N0 ).
*
* DMIN2 (input) DOUBLE PRECISION
* Minimum value of d, excluding D( N0 ) and D( N0-1 ).
*
* DN (input) DOUBLE PRECISION
* d(N)
*
* DN1 (input) DOUBLE PRECISION
* d(N-1)
*
* DN2 (input) DOUBLE PRECISION
* d(N-2)
*
* TAU (output) DOUBLE PRECISION
* This is the shift.
*
* TTYPE (output) INTEGER
* Shift type.
*
* G (input/output) DOUBLE PRECISION
* G is passed as an argument in order to save its value between
* calls to DLAZQ4
*
* Further Details
* ===============
* CNST1 = 9/16
*
* This is a thread safe version of DLASQ4, which passes G through the
* argument list in place of declaring G in a SAVE statment.
*
* =====================================================================
*
* .. Parameters ..
Method Summary |
static void |
DLAZQ4(int i0,
int n0,
double[] z,
int pp,
int n0in,
double dmin,
double dmin1,
double dmin2,
double dn,
double dn1,
double dn2,
doubleW tau,
intW ttype,
doubleW g)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DLAZQ4
public DLAZQ4()
DLAZQ4
public static void DLAZQ4(int i0,
int n0,
double[] z,
int pp,
int n0in,
double dmin,
double dmin1,
double dmin2,
double dn,
double dn1,
double dn2,
doubleW tau,
intW ttype,
doubleW g)