org.netlib.lapack
Class Dlarrc
java.lang.Object
org.netlib.lapack.Dlarrc
public class Dlarrc
- 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
* =======
*
* Find the number of eigenvalues of the symmetric tridiagonal matrix T
* that are in the interval (VL,VU] if JOBT = 'T', and of L D L^T
* if JOBT = 'L'.
*
* Arguments
* =========
*
* JOBT (input) CHARACTER*1
* = 'T': Compute Sturm count for matrix T.
* = 'L': Compute Sturm count for matrix L D L^T.
*
* N (input) INTEGER
* The order of the matrix. N > 0.
*
* VL (input) DOUBLE PRECISION
* VU (input) DOUBLE PRECISION
* The lower and upper bounds for the eigenvalues.
*
* D (input) DOUBLE PRECISION array, dimension (N)
* JOBT = 'T': The N diagonal elements of the tridiagonal matrix
* JOBT = 'L': The N diagonal elements of the diagonal matrix D.
*
* E (input) DOUBLE PRECISION array, dimension (N)
* JOBT = 'T': The N-1 offdiagonal elements of the matrix T.
* JOBT = 'L': The N-1 offdiagonal elements of the matrix L.
*
* PIVMIN (input) DOUBLE PRECISION
* The minimum pivot in the Sturm sequence for T.
*
* EIGCNT (output) INTEGER
* The number of eigenvalues of the symmetric tridiagonal matrix
* that are in the interval (VL,VU]
*
* LCNT (output) INTEGER
* RCNT (output) INTEGER
* The left and right negcounts of the interval.
*
* INFO (output) INTEGER
*
* Further Details
* ===============
*
* Based on contributions by
* Beresford Parlett, University of California, Berkeley, USA
* Jim Demmel, University of California, Berkeley, USA
* Inderjit Dhillon, University of Texas, Austin, USA
* Osni Marques, LBNL/NERSC, USA
* Christof Voemel, University of California, Berkeley, USA
*
* =====================================================================
*
* .. Parameters ..
Method Summary |
static void |
dlarrc(java.lang.String jobt,
int n,
double vl,
double vu,
double[] d,
int _d_offset,
double[] e,
int _e_offset,
double pivmin,
intW eigcnt,
intW lcnt,
intW rcnt,
intW info)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Dlarrc
public Dlarrc()
dlarrc
public static void dlarrc(java.lang.String jobt,
int n,
double vl,
double vu,
double[] d,
int _d_offset,
double[] e,
int _e_offset,
double pivmin,
intW eigcnt,
intW lcnt,
intW rcnt,
intW info)