org.netlib.lapack
Class Dlazq3
java.lang.Object
org.netlib.lapack.Dlazq3
public class Dlazq3
- 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
* =======
*
* DLAZQ3 checks for deflation, computes a shift (TAU) and calls dqds.
* In case of failure it changes shifts, and tries again until output
* is positive.
*
* Arguments
* =========
*
* 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.
*
* DMIN (output) DOUBLE PRECISION
* Minimum value of d.
*
* SIGMA (output) DOUBLE PRECISION
* Sum of shifts used in current segment.
*
* DESIG (input/output) DOUBLE PRECISION
* Lower order part of SIGMA
*
* QMAX (input) DOUBLE PRECISION
* Maximum value of q.
*
* NFAIL (output) INTEGER
* Number of times shift was too big.
*
* ITER (output) INTEGER
* Number of iterations.
*
* NDIV (output) INTEGER
* Number of divisions.
*
* IEEE (input) LOGICAL
* Flag for IEEE or non IEEE arithmetic (passed to DLASQ5).
*
* TTYPE (input/output) INTEGER
* Shift type. TTYPE is passed as an argument in order to save
* its value between calls to DLAZQ3
*
* DMIN1 (input/output) REAL
* DMIN2 (input/output) REAL
* DN (input/output) REAL
* DN1 (input/output) REAL
* DN2 (input/output) REAL
* TAU (input/output) REAL
* These are passed as arguments in order to save their values
* between calls to DLAZQ3
*
* This is a thread safe version of DLASQ3, which passes TTYPE, DMIN1,
* DMIN2, DN, DN1. DN2 and TAU through the argument list in place of
* declaring them in a SAVE statment.
*
* =====================================================================
*
* .. Parameters ..
Method Summary |
static void |
dlazq3(int i0,
intW n0,
double[] z,
int _z_offset,
int pp,
doubleW dmin,
doubleW sigma,
doubleW desig,
doubleW qmax,
intW nfail,
intW iter,
intW ndiv,
boolean ieee,
intW ttype,
doubleW dmin1,
doubleW dmin2,
doubleW dn,
doubleW dn1,
doubleW dn2,
doubleW tau)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Dlazq3
public Dlazq3()
dlazq3
public static void dlazq3(int i0,
intW n0,
double[] z,
int _z_offset,
int pp,
doubleW dmin,
doubleW sigma,
doubleW desig,
doubleW qmax,
intW nfail,
intW iter,
intW ndiv,
boolean ieee,
intW ttype,
doubleW dmin1,
doubleW dmin2,
doubleW dn,
doubleW dn1,
doubleW dn2,
doubleW tau)