org.netlib.lapack
Class DGTCON
java.lang.Object
org.netlib.lapack.DGTCON
public class DGTCON
 extends java.lang.Object
DGTCON is a simplified interface to the JLAPACK routine dgtcon.
This interface converts Javastyle 2D rowmajor arrays into
the 1D columnmajor 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
* =======
*
* DGTCON estimates the reciprocal of the condition number of a real
* tridiagonal matrix A using the LU factorization as computed by
* DGTTRF.
*
* An estimate is obtained for norm(inv(A)), and the reciprocal of the
* condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).
*
* Arguments
* =========
*
* NORM (input) CHARACTER*1
* Specifies whether the 1norm condition number or the
* infinitynorm condition number is required:
* = '1' or 'O': 1norm;
* = 'I': Infinitynorm.
*
* N (input) INTEGER
* The order of the matrix A. N >= 0.
*
* DL (input) DOUBLE PRECISION array, dimension (N1)
* The (n1) multipliers that define the matrix L from the
* LU factorization of A as computed by DGTTRF.
*
* D (input) DOUBLE PRECISION array, dimension (N)
* The n diagonal elements of the upper triangular matrix U from
* the LU factorization of A.
*
* DU (input) DOUBLE PRECISION array, dimension (N1)
* The (n1) elements of the first superdiagonal of U.
*
* DU2 (input) DOUBLE PRECISION array, dimension (N2)
* The (n2) elements of the second superdiagonal 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.
*
* ANORM (input) DOUBLE PRECISION
* If NORM = '1' or 'O', the 1norm of the original matrix A.
* If NORM = 'I', the infinitynorm of the original matrix A.
*
* RCOND (output) DOUBLE PRECISION
* The reciprocal of the condition number of the matrix A,
* computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an
* estimate of the 1norm of inv(A) computed in this routine.
*
* WORK (workspace) DOUBLE PRECISION array, dimension (2*N)
*
* IWORK (workspace) INTEGER array, dimension (N)
*
* INFO (output) INTEGER
* = 0: successful exit
* < 0: if INFO = i, the ith argument had an illegal value
*
* =====================================================================
*
* .. Parameters ..
Method Summary 
static void 
DGTCON(java.lang.String norm,
int n,
double[] dl,
double[] d,
double[] du,
double[] du2,
int[] ipiv,
double anorm,
doubleW rcond,
double[] work,
int[] iwork,
intW info)

Methods inherited from class java.lang.Object 
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait 
DGTCON
public DGTCON()
DGTCON
public static void DGTCON(java.lang.String norm,
int n,
double[] dl,
double[] d,
double[] du,
double[] du2,
int[] ipiv,
double anorm,
doubleW rcond,
double[] work,
int[] iwork,
intW info)