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Class org.netlib.lapack.Dorghr

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

public class Dorghr

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
 *  =======
 *
 *  DORGHR generates a real orthogonal matrix Q which is defined as the
 *  product of IHI-ILO elementary reflectors of order N, as returned by
 *  DGEHRD:
 *
 *  Q = H(ilo) H(ilo+1) . . . H(ihi-1).
 *
 *  Arguments
 *  =========
 *
 *  N       (input) INTEGER
 *          The order of the matrix Q. N >= 0.
 *
 *  ILO     (input) INTEGER
 *  IHI     (input) INTEGER
 *          ILO and IHI must have the same values as in the previous call
 *          of DGEHRD. Q is equal to the unit matrix except in the
 *          submatrix Q(ilo+1:ihi,ilo+1:ihi).
 *          1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
 *
 *  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
 *          On entry, the vectors which define the elementary reflectors,
 *          as returned by DGEHRD.
 *          On exit, the N-by-N orthogonal matrix Q.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A. LDA >= max(1,N).
 *
 *  TAU     (input) DOUBLE PRECISION array, dimension (N-1)
 *          TAU(i) must contain the scalar factor of the elementary
 *          reflector H(i), as returned by DGEHRD.
 *
 *  WORK    (workspace/output) DOUBLE PRECISION array, dimension (LWORK)
 *          On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
 *
 *  LWORK   (input) INTEGER
 *          The dimension of the array WORK. LWORK >= IHI-ILO.
 *          For optimum performance LWORK >= (IHI-ILO)*NB, where NB is
 *          the optimal blocksize.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Dorghr()

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

 public Dorghr()

 public static void dorghr(int n,
                           int ilo,
                           int ihi,
                           double a[],
                           int _a_offset,
                           int lda,
                           double tau[],
                           int _tau_offset,
                           double work[],
                           int _work_offset,
                           int lwork,
                           intW info)

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