Overview | Package | Class | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## org.netlib.lapack
Class Sorgbr

    java.lang.Object
      org.netlib.lapack.Sorgbr

    public class Sorgbr

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
     *  =======
     *
     *  SORGBR generates one of the real orthogonal matrices Q or P**T
     *  determined by SGEBRD when reducing a real matrix A to bidiagonal
     *  form: A = Q * B * P**T.  Q and P**T are defined as products of
     *  elementary reflectors H(i) or G(i) respectively.
     *
     *  If VECT = 'Q', A is assumed to have been an M-by-K matrix, and Q
     *  is of order M:
     *  if m >= k, Q = H(1) H(2) . . . H(k) and SORGBR returns the first n
     *  columns of Q, where m >= n >= k;
     *  if m < k, Q = H(1) H(2) . . . H(m-1) and SORGBR returns Q as an
     *  M-by-M matrix.
     *
     *  If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**T
     *  is of order N:
     *  if k < n, P**T = G(k) . . . G(2) G(1) and SORGBR returns the first m

     *  rows of P**T, where n >= m >= k;
     *  if k >= n, P**T = G(n-1) . . . G(2) G(1) and SORGBR returns P**T as
     *  an N-by-N matrix.
     *
     *  Arguments
     *  =========
     *
     *  VECT    (input) CHARACTER*1
     *          Specifies whether the matrix Q or the matrix P**T is
     *          required, as defined in the transformation applied by SGEBRD:
     *          = 'Q':  generate Q;
     *          = 'P':  generate P**T.
     *
     *  M       (input) INTEGER
     *          The number of rows of the matrix Q or P**T to be returned.
     *          M >= 0.
     *
     *  N       (input) INTEGER
     *          The number of columns of the matrix Q or P**T to be returned.
     *          N >= 0.
     *          If VECT = 'Q', M >= N >= min(M,K);
     *          if VECT = 'P', N >= M >= min(N,K).
     *
     *  K       (input) INTEGER
     *          If VECT = 'Q', the number of columns in the original M-by-K
     *          matrix reduced by SGEBRD.
     *          If VECT = 'P', the number of rows in the original K-by-N
     *          matrix reduced by SGEBRD.
     *          K >= 0.
     *
     *  A       (input/output) REAL array, dimension (LDA,N)
     *          On entry, the vectors which define the elementary reflectors,
     *          as returned by SGEBRD.
     *          On exit, the M-by-N matrix Q or P**T.
     *
     *  LDA     (input) INTEGER
     *          The leading dimension of the array A. LDA >= max(1,M).
     *
     *  TAU     (input) REAL array, dimension
     *                                (min(M,K)) if VECT = 'Q'
     *                                (min(N,K)) if VECT = 'P'
     *          TAU(i) must contain the scalar factor of the elementary
     *          reflector H(i) or G(i), which determines Q or P**T, as
     *          returned by SGEBRD in its array argument TAUQ or TAUP.
     *
     *  WORK    (workspace/output) REAL array, dimension (MAX(1,LWORK))
     *          On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
     *
     *  LWORK   (input) INTEGER
     *          The dimension of the array WORK. LWORK >= max(1,min(M,N)).
     *          For optimum performance LWORK >= min(M,N)*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
`Sorgbr()`

Method Summary
`static void` | `sorgbr(java.lang.String vect, int m, int n, int k, 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

### Sorgbr

    public Sorgbr()

Method Detail

### sorgbr

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

Overview | Package | Class | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD