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## org.netlib.lapack
Class Slarra

    java.lang.Object
      org.netlib.lapack.Slarra

    public class Slarra

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
     *  =======
     *
     *  Compute the splitting points with threshold SPLTOL.
     *  SLARRA sets any "small" off-diagonal elements to zero.
     *
     *  Arguments
     *  =========
     *
     *  N       (input) INTEGER
     *          The order of the matrix. N > 0.
     *
     *  D       (input) REAL             array, dimension (N)
     *          On entry, the N diagonal elements of the tridiagonal
     *          matrix T.
     *
     *  E       (input/output) REAL             array, dimension (N)
     *          On entry, the first (N-1) entries contain the subdiagonal
     *          elements of the tridiagonal matrix T; E(N) need not be set.
     *          On exit, the entries E( ISPLIT( I ) ), 1 <= I <= NSPLIT,
     *          are set to zero, the other entries of E are untouched.
     *
     *  E2      (input/output) REAL             array, dimension (N)
     *          On entry, the first (N-1) entries contain the SQUARES of the

     *          subdiagonal elements of the tridiagonal matrix T;
     *          E2(N) need not be set.
     *          On exit, the entries E2( ISPLIT( I ) ),
     *          1 <= I <= NSPLIT, have been set to zero
     *
     *  SPLTOL (input) REAL
     *          The threshold for splitting. Two criteria can be used:
     *          SPLTOL<0 : criterion based on absolute off-diagonal value
     *          SPLTOL>0 : criterion that preserves relative accuracy
     *
     *  TNRM (input) REAL
     *          The norm of the matrix.
     *
     *  NSPLIT  (output) INTEGER
     *          The number of blocks T splits into. 1 <= NSPLIT <= N.
     *
     *  ISPLIT  (output) INTEGER array, dimension (N)
     *          The splitting points, at which T breaks up into blocks.
     *          The first block consists of rows/columns 1 to ISPLIT(1),
     *          the second of rows/columns ISPLIT(1)+1 through ISPLIT(2),
     *          etc., and the NSPLIT-th consists of rows/columns
     *          ISPLIT(NSPLIT-1)+1 through ISPLIT(NSPLIT)=N.
     *
     *
     *  INFO    (output) INTEGER
     *          = 0:  successful exit
     *
     *  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 ..

Constructor Summary
`Slarra()`

Method Summary
`static void` | `slarra(int n, float[] d, int _d_offset, float[] e, int _e_offset, float[] e2, int _e2_offset, float spltol, float tnrm, intW nsplit, int[] isplit, int _isplit_offset, intW info)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Slarra

    public Slarra()

Method Detail

### slarra

    public static void slarra(int n,
                              float[] d,
                              int _d_offset,
                              float[] e,
                              int _e_offset,
                              float[] e2,
                              int _e2_offset,
                              float spltol,
                              float tnrm,
                              intW nsplit,
                              int[] isplit,
                              int _isplit_offset,
                              intW info)

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