org.netlib.lapack
Class Sorgtr

java.lang.Object
  org.netlib.lapack.Sorgtr

public class Sorgtr
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
 *  =======
 *
 *  SORGTR generates a real orthogonal matrix Q which is defined as the
 *  product of n-1 elementary reflectors of order N, as returned by
 *  SSYTRD:
 *
 *  if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),
 *
 *  if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).
 *
 *  Arguments
 *  =========
 *
 *  UPLO    (input) CHARACTER*1
 *          = 'U': Upper triangle of A contains elementary reflectors
 *                 from SSYTRD;
 *          = 'L': Lower triangle of A contains elementary reflectors
 *                 from SSYTRD.
 *
 *  N       (input) INTEGER
 *          The order of the matrix Q. N >= 0.
 *
 *  A       (input/output) REAL array, dimension (LDA,N)
 *          On entry, the vectors which define the elementary reflectors,
 *          as returned by SSYTRD.
 *          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) REAL array, dimension (N-1)
 *          TAU(i) must contain the scalar factor of the elementary
 *          reflector H(i), as returned by SSYTRD.
 *
 *  WORK    (workspace/output) REAL array, dimension (LWORK)
 *          On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
 *
 *  LWORK   (input) INTEGER
 *          The dimension of the array WORK. LWORK >= max(1,N-1).
 *          For optimum performance LWORK >= (N-1)*NB, 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
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Sorgtr()

Method Summary

static void

sorgtr(java.lang.String uplo, int n, float[] a, int _a_offset, int lda, float[] tau, int _tau_offset, float[] 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

Sorgtr

public Sorgtr()

Method Detail

sorgtr

public static void sorgtr(java.lang.String uplo,
                          int n,
                          float[] a,
                          int _a_offset,
                          int lda,
                          float[] tau,
                          int _tau_offset,
                          float[] work,
                          int _work_offset,
                          int lwork,
                          intW info)