org.netlib.lapack
Class DORG2L

java.lang.Object
  org.netlib.lapack.DORG2L

public class DORG2L
extends java.lang.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 ..

Constructor Summary

DORG2L()

Method Summary

static void

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DORG2L

public DORG2L()

Method Detail

DORG2L

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