All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class org.netlib.lapack.Dlantb

java.lang.Object
   |
   +----org.netlib.lapack.Dlantb

public class Dlantb

extends 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
 *  =======
 *
 *  DLANTB  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 triangular band matrix A,  with ( k + 1 ) diagonals.
 *
 *  Description
 *  ===========
 *
 *  DLANTB returns the value
 *
 *     DLANTB = ( 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 DLANTB as described
 *          above.
 *
 *  UPLO    (input) CHARACTER*1
 *          Specifies whether the matrix A is upper or lower triangular.
 *          = 'U':  Upper triangular
 *          = 'L':  Lower triangular
 *
 *  DIAG    (input) CHARACTER*1
 *          Specifies whether or not the matrix A is unit triangular.
 *          = 'N':  Non-unit triangular
 *          = 'U':  Unit triangular
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.  When N = 0, DLANTB is
 *          set to zero.
 *
 *  K       (input) INTEGER
 *          The number of super-diagonals of the matrix A if UPLO = 'U',
 *          or the number of sub-diagonals of the matrix A if UPLO = 'L'.
 *          K >= 0.
 *
 *  AB      (input) DOUBLE PRECISION array, dimension (LDAB,N)
 *          The upper or lower triangular band matrix A, stored in the
 *          first k+1 rows of AB.  The j-th column of A is stored
 *          in the j-th column of the array AB as follows:
 *          if UPLO = 'U', AB(k+1+i-j,j) = A(i,j) for max(1,j-k)<=i<=j;
 *          if UPLO = 'L', AB(1+i-j,j)   = A(i,j) for j<=i<=min(n,j+k).
 *          Note that when DIAG = 'U', the elements of the array AB
 *          corresponding to the diagonal elements of the matrix A are
 *          not referenced, but are assumed to be one.
 *
 *  LDAB    (input) INTEGER
 *          The leading dimension of the array AB.  LDAB >= K+1.
 *
 *  WORK    (workspace) DOUBLE PRECISION array, dimension (LWORK),
 *          where LWORK >= N when NORM = 'I'; otherwise, WORK is not
 *          referenced.
 *
 * =====================================================================
 *
 *     .. Parameters ..

Dlantb()

dlantb(String, String, String, int, int, double[], int, int, double[], int)

 public Dlantb()

 public static double dlantb(String norm,
                             String uplo,
                             String diag,
                             int n,
                             int k,
                             double ab[],
                             int _ab_offset,
                             int ldab,
                             double work[],
                             int _work_offset)

All Packages  Class Hierarchy  This Package  Previous  Next  Index