org.netlib.lapack
Class Dlangb

java.lang.Object
  org.netlib.lapack.Dlangb

public class Dlangb
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
 *  =======
 *
 *  DLANGB  returns the value of the one norm,  or the Frobenius norm, or
 *  the  infinity norm,  or the element of  largest absolute value  of an
 *  n by n band matrix  A,  with kl sub-diagonals and ku super-diagonals.
 *
 *  Description
 *  ===========
 *
 *  DLANGB returns the value
 *
 *     DLANGB = ( max(abs(A(i,j))), NORM = 'M' or 'm'
 *              (
 *              ( norm1(A),         NORM = '1', 'O' or 'o'
 *              (
 *              ( normI(A),         NORM = 'I' or 'i'
 *              (
 *              ( normF(A),         NORM = 'F', 'f', 'E' or 'e'
 *
 *  where  norm1  denotes the  one norm of a matrix (maximum column sum),
 *  normI  denotes the  infinity norm  of a matrix  (maximum row sum) and
 *  normF  denotes the  Frobenius norm of a matrix (square root of sum of
 *  squares).  Note that  max(abs(A(i,j)))  is not a  matrix norm.
 *
 *  Arguments
 *  =========
 *
 *  NORM    (input) CHARACTER*1
 *          Specifies the value to be returned in DLANGB as described
 *          above.
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.  When N = 0, DLANGB is
 *          set to zero.
 *
 *  KL      (input) INTEGER
 *          The number of sub-diagonals of the matrix A.  KL >= 0.
 *
 *  KU      (input) INTEGER
 *          The number of super-diagonals of the matrix A.  KU >= 0.
 *
 *  AB      (input) DOUBLE PRECISION array, dimension (LDAB,N)
 *          The band matrix A, stored in rows 1 to KL+KU+1.  The j-th
 *          column of A is stored in the j-th column of the array AB as
 *          follows:
 *          AB(ku+1+i-j,j) = A(i,j) for max(1,j-ku)<=i<=min(n,j+kl).
 *
 *  LDAB    (input) INTEGER
 *          The leading dimension of the array AB.  LDAB >= KL+KU+1.
 *
 *  WORK    (workspace) DOUBLE PRECISION array, dimension (LWORK),
 *          where LWORK >= N when NORM = 'I'; otherwise, WORK is not
 *          referenced.
 *
 * =====================================================================

 *
 *
 *     .. Parameters ..

Constructor Summary

Dlangb()

Method Summary

static double

dlangb(java.lang.String norm, int n, int kl, int ku, double[] ab, int _ab_offset, int ldab, double[] work, int _work_offset)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dlangb

public Dlangb()

Method Detail

dlangb

public static double dlangb(java.lang.String norm,
                            int n,
                            int kl,
                            int ku,
                            double[] ab,
                            int _ab_offset,
                            int ldab,
                            double[] work,
                            int _work_offset)