org.netlib.lapack
Class SGTTS2

java.lang.Object
  org.netlib.lapack.SGTTS2

public class SGTTS2
extends java.lang.Object

SGTTS2 is a simplified interface to the JLAPACK routine sgtts2.
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
 *  =======
 *
 *  SGTTS2 solves one of the systems of equations
 *     A*X = B  or  A'*X = B,
 *  with a tridiagonal matrix A using the LU factorization computed
 *  by SGTTRF.
 *
 *  Arguments
 *  =========
 *
 *  ITRANS  (input) INTEGER
 *          Specifies the form of the system of equations.
 *          = 0:  A * X = B  (No transpose)
 *          = 1:  A'* X = B  (Transpose)
 *          = 2:  A'* X = B  (Conjugate transpose = Transpose)
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.
 *
 *  NRHS    (input) INTEGER
 *          The number of right hand sides, i.e., the number of columns
 *          of the matrix B.  NRHS >= 0.
 *
 *  DL      (input) REAL array, dimension (N-1)
 *          The (n-1) multipliers that define the matrix L from the
 *          LU factorization of A.
 *
 *  D       (input) REAL array, dimension (N)
 *          The n diagonal elements of the upper triangular matrix U from
 *          the LU factorization of A.
 *
 *  DU      (input) REAL array, dimension (N-1)
 *          The (n-1) elements of the first super-diagonal of U.
 *
 *  DU2     (input) REAL array, dimension (N-2)
 *          The (n-2) elements of the second super-diagonal of U.
 *
 *  IPIV    (input) INTEGER array, dimension (N)
 *          The pivot indices; for 1 <= i <= n, row i of the matrix was
 *          interchanged with row IPIV(i).  IPIV(i) will always be either
 *          i or i+1; IPIV(i) = i indicates a row interchange was not
 *          required.
 *
 *  B       (input/output) REAL array, dimension (LDB,NRHS)
 *          On entry, the matrix of right hand side vectors B.
 *          On exit, B is overwritten by the solution vectors X.
 *
 *  LDB     (input) INTEGER
 *          The leading dimension of the array B.  LDB >= max(1,N).
 *
 *  =====================================================================
 *
 *     .. Local Scalars ..

Constructor Summary

SGTTS2()

Method Summary

static void

SGTTS2(int itrans, int n, int nrhs, float[] dl, float[] d, float[] du, float[] du2, int[] ipiv, float[][] b)

Methods inherited from class java.lang.Object

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

Constructor Detail

SGTTS2

public SGTTS2()

Method Detail

SGTTS2

public static void SGTTS2(int itrans,
                          int n,
                          int nrhs,
                          float[] dl,
                          float[] d,
                          float[] du,
                          float[] du2,
                          int[] ipiv,
                          float[][] b)