All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class org.netlib.lapack.DORG2L

java.lang.Object
   |
   +----org.netlib.lapack.DORG2L

public class DORG2L

extends Object

DORG2L is a simplified interface to the JLAPACK routine dorg2l.
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
 *  =======
 *
 *  DORG2L generates an m by n real matrix Q with orthonormal columns,
 *  which is defined as the last n columns of a product of k elementary
 *  reflectors of order m
 *
 *        Q  =  H(k) . . . H(2) H(1)
 *
 *  as returned by DGEQLF.
 *
 *  Arguments
 *  =========
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix Q. M >= 0.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix Q. M >= N >= 0.
 *
 *  K       (input) INTEGER
 *          The number of elementary reflectors whose product defines the
 *          matrix Q. N >= K >= 0.
 *
 *  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
 *          On entry, the (n-k+i)-th column must contain the vector which
 *          defines the elementary reflector H(i), for i = 1,2,...,k, as
 *          returned by DGEQLF in the last k columns of its array
 *          argument A.
 *          On exit, the m by n matrix Q.
 *
 *  LDA     (input) INTEGER
 *          The first dimension of the array A. LDA >= max(1,M).
 *
 *  TAU     (input) DOUBLE PRECISION array, dimension (K)
 *          TAU(i) must contain the scalar factor of the elementary
 *          reflector H(i), as returned by DGEQLF.
 *
 *  WORK    (workspace) DOUBLE PRECISION array, dimension (N)
 *
 *  INFO    (output) INTEGER
 *          = 0: successful exit
 *          < 0: if INFO = -i, the i-th argument has an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

DORG2L()

DORG2L(int, int, int, double[][], double[], double[], intW)

 public DORG2L()

 public static void DORG2L(int m,
                           int n,
                           int k,
                           double a[][],
                           double tau[],
                           double work[],
                           intW info)

All Packages  Class Hierarchy  This Package  Previous  Next  Index