org.netlib.lapack
Class Dlarz

java.lang.Object
  org.netlib.lapack.Dlarz

public class Dlarz
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
 *  =======
 *
 *  DLARZ applies a real elementary reflector H to a real M-by-N
 *  matrix C, from either the left or the right. H is represented in the

 *  form
 *
 *        H = I - tau * v * v'
 *
 *  where tau is a real scalar and v is a real vector.
 *
 *  If tau = 0, then H is taken to be the unit matrix.
 *
 *
 *  H is a product of k elementary reflectors as returned by DTZRZF.
 *
 *  Arguments
 *  =========
 *
 *  SIDE    (input) CHARACTER*1
 *          = 'L': form  H * C
 *          = 'R': form  C * H
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix C.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix C.
 *
 *  L       (input) INTEGER
 *          The number of entries of the vector V containing
 *          the meaningful part of the Householder vectors.
 *          If SIDE = 'L', M >= L >= 0, if SIDE = 'R', N >= L >= 0.
 *
 *  V       (input) DOUBLE PRECISION array, dimension (1+(L-1)*abs(INCV))
 *          The vector v in the representation of H as returned by
 *          DTZRZF. V is not used if TAU = 0.
 *
 *  INCV    (input) INTEGER
 *          The increment between elements of v. INCV <> 0.
 *
 *  TAU     (input) DOUBLE PRECISION
 *          The value tau in the representation of H.
 *
 *  C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
 *          On entry, the M-by-N matrix C.
 *          On exit, C is overwritten by the matrix H * C if SIDE = 'L',

 *          or C * H if SIDE = 'R'.
 *
 *  LDC     (input) INTEGER
 *          The leading dimension of the array C. LDC >= max(1,M).
 *
 *  WORK    (workspace) DOUBLE PRECISION array, dimension
 *                         (N) if SIDE = 'L'
 *                      or (M) if SIDE = 'R'
 *
 *  Further Details
 *  ===============
 *
 *  Based on contributions by
 *    A. Petitet, Computer Science Dept., Univ. of Tenn., Knoxville, USA

 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dlarz()

Method Summary

static void

dlarz(java.lang.String side, int m, int n, int l, double[] v, int _v_offset, int incv, double tau, double[] c, int _c_offset, int Ldc, 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

Dlarz

public Dlarz()

Method Detail

dlarz

public static void dlarz(java.lang.String side,
                         int m,
                         int n,
                         int l,
                         double[] v,
                         int _v_offset,
                         int incv,
                         double tau,
                         double[] c,
                         int _c_offset,
                         int Ldc,
                         double[] work,
                         int _work_offset)