org.netlib.lapack
Class Dlasq4
java.lang.Object
org.netlib.lapack.Dlasq4
public class Dlasq4
- extends java.lang.Object
Following is the description from the original
Fortran source. For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.
* ..
*
* Purpose
* =======
*
* DLASQ4 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.
*
* Further Details
* ===============
* CNST1 = 9/16
*
* =====================================================================
*
* .. Parameters ..
Field Summary |
static double |
g
|
Method Summary |
static void |
dlasq4(int i0,
int n0,
double[] z,
int _z_offset,
int pp,
int n0in,
double dmin,
double dmin1,
double dmin2,
double dn,
double dn1,
double dn2,
doubleW tau,
intW ttype)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
g
public static double g
Dlasq4
public Dlasq4()
dlasq4
public static void dlasq4(int i0,
int n0,
double[] z,
int _z_offset,
int pp,
int n0in,
double dmin,
double dmin1,
double dmin2,
double dn,
double dn1,
double dn2,
doubleW tau,
intW ttype)