org.netlib.lapack
Class Sgbbrd

java.lang.Object
  extended by org.netlib.lapack.Sgbbrd

public class Sgbbrd
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 * ======= * * SGBBRD 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) REAL 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) REAL array, dimension (min(M,N)) * The diagonal elements of the bidiagonal matrix B. * * E (output) REAL array, dimension (min(M,N)-1) * The superdiagonal elements of the bidiagonal matrix B. * * Q (output) REAL 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) REAL 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) REAL 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) REAL 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
Sgbbrd()
           
 
Method Summary
static void sgbbrd(java.lang.String vect, int m, int n, int ncc, int kl, int ku, float[] ab, int _ab_offset, int ldab, float[] d, int _d_offset, float[] e, int _e_offset, float[] q, int _q_offset, int ldq, float[] pt, int _pt_offset, int ldpt, float[] c, int _c_offset, int Ldc, float[] work, int _work_offset, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Sgbbrd

public Sgbbrd()
Method Detail

sgbbrd

public static void sgbbrd(java.lang.String vect,
                          int m,
                          int n,
                          int ncc,
                          int kl,
                          int ku,
                          float[] ab,
                          int _ab_offset,
                          int ldab,
                          float[] d,
                          int _d_offset,
                          float[] e,
                          int _e_offset,
                          float[] q,
                          int _q_offset,
                          int ldq,
                          float[] pt,
                          int _pt_offset,
                          int ldpt,
                          float[] c,
                          int _c_offset,
                          int Ldc,
                          float[] work,
                          int _work_offset,
                          intW info)