org.netlib.lapack
Class Dgtsv

java.lang.Object
  extended by org.netlib.lapack.Dgtsv

public class Dgtsv
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 * ======= * * DGTSV 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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
Dgtsv()
           
 
Method Summary
static void dgtsv(int n, int nrhs, double[] dl, int _dl_offset, double[] d, int _d_offset, double[] du, int _du_offset, double[] 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

Dgtsv

public Dgtsv()
Method Detail

dgtsv

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