org.netlib.lapack
Class Spttrf

java.lang.Object
  org.netlib.lapack.Spttrf

public class Spttrf
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
 *  =======
 *
 *  SPTTRF computes the L*D*L' factorization of a real symmetric
 *  positive definite tridiagonal matrix A.  The factorization may also
 *  be regarded as having the form A = U'*D*U.
 *
 *  Arguments
 *  =========
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  D       (input/output) REAL array, dimension (N)
 *          On entry, the n diagonal elements of the tridiagonal matrix
 *          A.  On exit, the n diagonal elements of the diagonal matrix
 *          D from the L*D*L' factorization of A.
 *
 *  E       (input/output) REAL array, dimension (N-1)
 *          On entry, the (n-1) subdiagonal elements of the tridiagonal
 *          matrix A.  On exit, the (n-1) subdiagonal elements of the
 *          unit bidiagonal factor L from the L*D*L' factorization of A.

 *          E can also be regarded as the superdiagonal of the unit
 *          bidiagonal factor U from the U'*D*U factorization of A.
 *
 *  INFO    (output) INTEGER
 *          = 0: successful exit
 *          < 0: if INFO = -k, the k-th argument had an illegal value
 *          > 0: if INFO = k, the leading minor of order k is not
 *               positive definite; if k < N, the factorization could not
 *               be completed, while if k = N, the factorization was
 *               completed, but D(N) = 0.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Spttrf()

Method Summary

static void

spttrf(int n, float[] d, int _d_offset, float[] e, int _e_offset, intW info)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Spttrf

public Spttrf()

Method Detail

spttrf

public static void spttrf(int n,
                          float[] d,
                          int _d_offset,
                          float[] e,
                          int _e_offset,
                          intW info)