org.netlib.lapack
Class Dormhr

java.lang.Object
  org.netlib.lapack.Dormhr

public class Dormhr
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
 *  =======
 *
 *  DORMHR overwrites the general real M-by-N matrix C with
 *
 *                  SIDE = 'L'     SIDE = 'R'
 *  TRANS = 'N':      Q * C          C * Q
 *  TRANS = 'T':      Q**T * C       C * Q**T
 *
 *  where Q is a real orthogonal matrix of order nq, with nq = m if
 *  SIDE = 'L' and nq = n if SIDE = 'R'. Q is defined as the product of
 *  IHI-ILO elementary reflectors, as returned by DGEHRD:
 *
 *  Q = H(ilo) H(ilo+1) . . . H(ihi-1).
 *
 *  Arguments
 *  =========
 *
 *  SIDE    (input) CHARACTER*1
 *          = 'L': apply Q or Q**T from the Left;
 *          = 'R': apply Q or Q**T from the Right.
 *
 *  TRANS   (input) CHARACTER*1
 *          = 'N':  No transpose, apply Q;
 *          = 'T':  Transpose, apply Q**T.
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix C. M >= 0.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix C. 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).
 *          If SIDE = 'L', then 1 <= ILO <= IHI <= M, if M > 0, and
 *          ILO = 1 and IHI = 0, if M = 0;
 *          if SIDE = 'R', then 1 <= ILO <= IHI <= N, if N > 0, and
 *          ILO = 1 and IHI = 0, if N = 0.
 *
 *  A       (input) DOUBLE PRECISION array, dimension
 *                               (LDA,M) if SIDE = 'L'
 *                               (LDA,N) if SIDE = 'R'
 *          The vectors which define the elementary reflectors, as
 *          returned by DGEHRD.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.
 *          LDA >= max(1,M) if SIDE = 'L'; LDA >= max(1,N) if SIDE = 'R'.
 *
 *  TAU     (input) DOUBLE PRECISION array, dimension
 *                               (M-1) if SIDE = 'L'
 *                               (N-1) if SIDE = 'R'
 *          TAU(i) must contain the scalar factor of the elementary
 *          reflector H(i), as returned by DGEHRD.
 *
 *  C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
 *          On entry, the M-by-N matrix C.
 *          On exit, C is overwritten by Q*C or Q**T*C or C*Q**T or C*Q.

 *
 *  LDC     (input) INTEGER
 *          The leading dimension of the array C. LDC >= max(1,M).
 *
 *  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.
 *          If SIDE = 'L', LWORK >= max(1,N);
 *          if SIDE = 'R', LWORK >= max(1,M).
 *          For optimum performance LWORK >= N*NB if SIDE = 'L', and
 *          LWORK >= M*NB if SIDE = 'R', where NB is the optimal
 *          blocksize.
 *
 *          If LWORK = -1, then a workspace query is assumed; the routine
 *          only calculates the optimal size of the WORK array, returns
 *          this value as the first entry of the WORK array, and no error
 *          message related to LWORK is issued by XERBLA.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Local Scalars ..

Constructor Summary

Dormhr()

Method Summary

static void

dormhr(java.lang.String side, java.lang.String trans, int m, int n, int ilo, int ihi, double[] a, int _a_offset, int lda, double[] tau, int _tau_offset, double[] c, int _c_offset, int Ldc, double[] work, int _work_offset, int lwork, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dormhr

public Dormhr()

Method Detail

dormhr

public static void dormhr(java.lang.String side,
                          java.lang.String trans,
                          int m,
                          int n,
                          int ilo,
                          int ihi,
                          double[] a,
                          int _a_offset,
                          int lda,
                          double[] tau,
                          int _tau_offset,
                          double[] c,
                          int _c_offset,
                          int Ldc,
                          double[] work,
                          int _work_offset,
                          int lwork,
                          intW info)