org.netlib.lapack
Class Sgtsv

java.lang.Object
  org.netlib.lapack.Sgtsv

public class Sgtsv
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
 *  =======
 *
 *  SGTSV  solves the equation
 *
 *     A*X = B,
 *
 *  where A is an n by n tridiagonal matrix, by Gaussian elimination with
 *  partial pivoting.
 *
 *  Note that the equation  A'*X = B  may be solved by interchanging the

 *  order of the arguments DU and DL.
 *
 *  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.
 *
 *  DL      (input/output) REAL array, dimension (N-1)
 *          On entry, DL must contain the (n-1) sub-diagonal elements of

 *          A.
 *
 *          On exit, DL is overwritten by the (n-2) elements of the
 *          second super-diagonal of the upper triangular matrix U from
 *          the LU factorization of A, in DL(1), ..., DL(n-2).
 *
 *  D       (input/output) REAL array, dimension (N)
 *          On entry, D must contain the diagonal elements of A.
 *
 *          On exit, D is overwritten by the n diagonal elements of U.
 *
 *  DU      (input/output) REAL array, dimension (N-1)
 *          On entry, DU must contain the (n-1) super-diagonal elements
 *          of A.
 *
 *          On exit, DU is overwritten by the (n-1) elements of the first
 *          super-diagonal of U.
 *
 *  B       (input/output) REAL array, dimension (LDB,NRHS)
 *          On entry, the N by NRHS matrix of 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, U(i,i) is exactly zero, and the solution
 *               has not been computed.  The factorization has not been
 *               completed unless i = N.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Sgtsv()

Method Summary

static void

sgtsv(int n, int nrhs, float[] dl, int _dl_offset, float[] d, int _d_offset, float[] du, int _du_offset, float[] b, int _b_offset, int ldb, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Sgtsv

public Sgtsv()

Method Detail

sgtsv

public static void sgtsv(int n,
                         int nrhs,
                         float[] dl,
                         int _dl_offset,
                         float[] d,
                         int _d_offset,
                         float[] du,
                         int _du_offset,
                         float[] b,
                         int _b_offset,
                         int ldb,
                         intW info)