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## org.netlib.lapack
Class DGBBRD

    java.lang.Object
      org.netlib.lapack.DGBBRD

    public class DGBBRD

extends java.lang.Object

    DGBBRD is a simplified interface to the JLAPACK routine dgbbrd.
    This interface converts Java-style 2D row-major arrays into
    the 1D column-major linearized arrays expected by the lower
    level JLAPACK routines.  Using this interface also allows you
    to omit offset and leading dimension arguments.  However, because
    of these conversions, these routines will be slower than the low
    level ones.  Following is the description from the original Fortran
    source.  Contact seymour@cs.utk.edu with any questions.

     *     ..
     *
     *  Purpose
     *  =======
     *
     *  DGBBRD reduces a real general m-by-n band matrix A to upper
     *  bidiagonal form B by an orthogonal transformation: Q' * A * P = B.
     *
     *  The routine computes B, and optionally forms Q or P', or computes
     *  Q'*C for a given matrix C.
     *
     *  Arguments
     *  =========
     *
     *  VECT    (input) CHARACTER*1
     *          Specifies whether or not the matrices Q and P' are to be
     *          formed.
     *          = 'N': do not form Q or P';
     *          = 'Q': form Q only;
     *          = 'P': form P' only;
     *          = 'B': form both.
     *
     *  M       (input) INTEGER
     *          The number of rows of the matrix A.  M >= 0.
     *
     *  N       (input) INTEGER
     *          The number of columns of the matrix A.  N >= 0.
     *
     *  NCC     (input) INTEGER
     *          The number of columns of the matrix C.  NCC >= 0.
     *
     *  KL      (input) INTEGER
     *          The number of subdiagonals of the matrix A. KL >= 0.
     *
     *  KU      (input) INTEGER
     *          The number of superdiagonals of the matrix A. KU >= 0.
     *
     *  AB      (input/output) DOUBLE PRECISION array, dimension (LDAB,N)
     *          On entry, the m-by-n band matrix A, stored in rows 1 to
     *          KL+KU+1. The j-th column of A is stored in the j-th column of
     *          the array AB as follows:
     *          AB(ku+1+i-j,j) = A(i,j) for max(1,j-ku)<=i<=min(m,j+kl).
     *          On exit, A is overwritten by values generated during the
     *          reduction.
     *
     *  LDAB    (input) INTEGER
     *          The leading dimension of the array A. LDAB >= KL+KU+1.
     *
     *  D       (output) DOUBLE PRECISION array, dimension (min(M,N))
     *          The diagonal elements of the bidiagonal matrix B.
     *
     *  E       (output) DOUBLE PRECISION array, dimension (min(M,N)-1)
     *          The superdiagonal elements of the bidiagonal matrix B.
     *
     *  Q       (output) DOUBLE PRECISION array, dimension (LDQ,M)
     *          If VECT = 'Q' or 'B', the m-by-m orthogonal matrix Q.
     *          If VECT = 'N' or 'P', the array Q is not referenced.
     *
     *  LDQ     (input) INTEGER
     *          The leading dimension of the array Q.
     *          LDQ >= max(1,M) if VECT = 'Q' or 'B'; LDQ >= 1 otherwise.
     *
     *  PT      (output) DOUBLE PRECISION array, dimension (LDPT,N)
     *          If VECT = 'P' or 'B', the n-by-n orthogonal matrix P'.
     *          If VECT = 'N' or 'Q', the array PT is not referenced.
     *
     *  LDPT    (input) INTEGER
     *          The leading dimension of the array PT.
     *          LDPT >= max(1,N) if VECT = 'P' or 'B'; LDPT >= 1 otherwise.
     *
     *  C       (input/output) DOUBLE PRECISION array, dimension (LDC,NCC)
     *          On entry, an m-by-ncc matrix C.
     *          On exit, C is overwritten by Q'*C.
     *          C is not referenced if NCC = 0.
     *
     *  LDC     (input) INTEGER
     *          The leading dimension of the array C.
     *          LDC >= max(1,M) if NCC > 0; LDC >= 1 if NCC = 0.
     *
     *  WORK    (workspace) DOUBLE PRECISION array, dimension (2*max(M,N))
     *
     *  INFO    (output) INTEGER
     *          = 0:  successful exit.
     *          < 0:  if INFO = -i, the i-th argument had an illegal value.
     *
     *  =====================================================================
     *
     *     .. Parameters ..

Constructor Summary
`DGBBRD()`

Method Summary
`static void` | `DGBBRD(java.lang.String vect, int m, int n, int ncc, int kl, int ku, double[][] ab, double[] d, double[] e, double[][] q, double[][] pt, double[][] c, double[] work, intW info)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DGBBRD

    public DGBBRD()

Method Detail

### DGBBRD

    public static void DGBBRD(java.lang.String vect,
                              int m,
                              int n,
                              int ncc,
                              int kl,
                              int ku,
                              double[][] ab,
                              double[] d,
                              double[] e,
                              double[][] q,
                              double[][] pt,
                              double[][] c,
                              double[] work,
                              intW info)

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