All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class org.netlib.lapack.Dtrcon

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

public class Dtrcon

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
 *  =======
 *
 *  DTRCON estimates the reciprocal of the condition number of a
 *  triangular matrix A, in either the 1-norm or the infinity-norm.
 *
 *  The norm of A is computed and an estimate is obtained for
 *  norm(inv(A)), then 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.
 *
 *  UPLO    (input) CHARACTER*1
 *          = 'U':  A is upper triangular;
 *          = 'L':  A is lower triangular.
 *
 *  DIAG    (input) CHARACTER*1
 *          = 'N':  A is non-unit triangular;
 *          = 'U':  A is unit triangular.
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  A       (input) DOUBLE PRECISION array, dimension (LDA,N)
 *          The triangular matrix A.  If UPLO = 'U', the leading N-by-N
 *          upper triangular part of the array A contains the upper
 *          triangular matrix, and the strictly lower triangular part of
 *          A is not referenced.  If UPLO = 'L', the leading N-by-N lower
 *          triangular part of the array A contains the lower triangular
 *          matrix, and the strictly upper triangular part of A is not
 *          referenced.  If DIAG = 'U', the diagonal elements of A are
 *          also not referenced and are assumed to be 1.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(1,N).
 *
 *  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 ..

Dtrcon()

dtrcon(String, String, String, int, double[], int, int, doubleW, double[], int, int[], int, intW)

 public Dtrcon()

 public static void dtrcon(String norm,
                           String uplo,
                           String diag,
                           int n,
                           double a[],
                           int _a_offset,
                           int lda,
                           doubleW rcond,
                           double work[],
                           int _work_offset,
                           int iwork[],
                           int _iwork_offset,
                           intW info)

All Packages  Class Hierarchy  This Package  Previous  Next  Index