org.netlib.lapack
Class DGBCON

java.lang.Object
  org.netlib.lapack.DGBCON

public class DGBCON
extends java.lang.Object

DGBCON is a simplified interface to the JLAPACK routine dgbcon.
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
 *  =======
 *
 *  DGBCON estimates the reciprocal of the condition number of a real
 *  general band matrix A, in either the 1-norm or the infinity-norm,
 *  using the LU factorization computed by DGBTRF.
 *
 *  An estimate is obtained for norm(inv(A)), and the reciprocal of the
 *  condition number is computed as
 *     RCOND = 1 / ( norm(A) * norm(inv(A)) ).
 *
 *  Arguments
 *  =========
 *
 *  NORM    (input) CHARACTER*1
 *          Specifies whether the 1-norm condition number or the
 *          infinity-norm condition number is required:
 *          = '1' or 'O':  1-norm;
 *          = 'I':         Infinity-norm.
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  KL      (input) INTEGER
 *          The number of subdiagonals within the band of A.  KL >= 0.
 *
 *  KU      (input) INTEGER
 *          The number of superdiagonals within the band of A.  KU >= 0.

 *
 *  AB      (input) DOUBLE PRECISION array, dimension (LDAB,N)
 *          Details of the LU factorization of the band matrix A, as
 *          computed by DGBTRF.  U is stored as an upper triangular band

 *          matrix with KL+KU superdiagonals in rows 1 to KL+KU+1, and
 *          the multipliers used during the factorization are stored in
 *          rows KL+KU+2 to 2*KL+KU+1.
 *
 *  LDAB    (input) INTEGER
 *          The leading dimension of the array AB.  LDAB >= 2*KL+KU+1.
 *
 *  IPIV    (input) INTEGER array, dimension (N)
 *          The pivot indices; for 1 <= i <= N, row i of the matrix was
 *          interchanged with row IPIV(i).
 *
 *  ANORM   (input) DOUBLE PRECISION
 *          If NORM = '1' or 'O', the 1-norm of the original matrix A.
 *          If NORM = 'I', the infinity-norm of the original matrix A.
 *
 *  RCOND   (output) DOUBLE PRECISION
 *          The reciprocal of the condition number of the matrix A,
 *          computed as RCOND = 1/(norm(A) * norm(inv(A))).
 *
 *  WORK    (workspace) DOUBLE PRECISION array, dimension (3*N)
 *
 *  IWORK   (workspace) INTEGER array, dimension (N)
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0: if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

DGBCON()

Method Summary

static void

DGBCON(java.lang.String norm, int n, int kl, int ku, double[][] ab, 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

Constructor Detail

DGBCON

public DGBCON()

Method Detail

DGBCON

public static void DGBCON(java.lang.String norm,
                          int n,
                          int kl,
                          int ku,
                          double[][] ab,
                          int[] ipiv,
                          double anorm,
                          doubleW rcond,
                          double[] work,
                          int[] iwork,
                          intW info)