org.netlib.lapack
Class SPTSV

java.lang.Object
  org.netlib.lapack.SPTSV

public class SPTSV
extends java.lang.Object

SPTSV is a simplified interface to the JLAPACK routine sptsv.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

 *     ..
 *
 *  Purpose
 *  =======
 *
 *  SPTSV computes the solution to a real system of linear equations
 *  A*X = B, where A is an N-by-N symmetric positive definite tridiagonal
 *  matrix, and X and B are N-by-NRHS matrices.
 *
 *  A is factored as A = L*D*L**T, and the factored form of A is then
 *  used to solve the system of equations.
 *
 *  Arguments
 *  =========
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  NRHS    (input) INTEGER
 *          The number of right hand sides, i.e., the number of columns
 *          of the matrix B.  NRHS >= 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 factorization A = L*D*L**T.
 *
 *  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**T factorization of
 *          A.  (E can also be regarded as the superdiagonal of the unit

 *          bidiagonal factor U from the U**T*D*U factorization of A.)
 *
 *  B       (input/output) REAL array, dimension (LDB,NRHS)
 *          On entry, the N-by-NRHS right hand side matrix B.
 *          On exit, if INFO = 0, the N-by-NRHS solution matrix X.
 *
 *  LDB     (input) INTEGER
 *          The leading dimension of the array B.  LDB >= max(1,N).
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *          > 0:  if INFO = i, the leading minor of order i is not
 *                positive definite, and the solution has not been
 *                computed.  The factorization has not been completed
 *                unless i = N.
 *
 *  =====================================================================
 *
 *     .. External Subroutines ..

Constructor Summary

SPTSV()

Method Summary

static void

SPTSV(int n, int nrhs, float[] d, float[] e, float[][] b, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

SPTSV

public SPTSV()

Method Detail

SPTSV

public static void SPTSV(int n,
                         int nrhs,
                         float[] d,
                         float[] e,
                         float[][] b,
                         intW info)