org.netlib.lapack
Class DLAQSB

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

public class DLAQSB
extends java.lang.Object

DLAQSB is a simplified interface to the JLAPACK routine dlaqsb.
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 * ======= * * DLAQSB equilibrates a symmetric band matrix A using the scaling * factors in the vector S. * * Arguments * ========= * * UPLO (input) CHARACTER*1 * Specifies whether the upper or lower triangular part of the * symmetric matrix A is stored. * = 'U': Upper triangular * = 'L': Lower triangular * * N (input) INTEGER * The order of the matrix A. N >= 0. * * KD (input) INTEGER * The number of super-diagonals of the matrix A if UPLO = 'U', * or the number of sub-diagonals if UPLO = 'L'. KD >= 0. * * AB (input/output) DOUBLE PRECISION array, dimension (LDAB,N) * On entry, the upper or lower triangle of the symmetric band * matrix A, stored in the first KD+1 rows of the array. The * j-th column of A is stored in the j-th column of the array AB * as follows: * if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j; * if UPLO = 'L', AB(1+i-j,j) = A(i,j) for j<=i<=min(n,j+kd). * * On exit, if INFO = 0, the triangular factor U or L from the * Cholesky factorization A = U'*U or A = L*L' of the band * matrix A, in the same storage format as A. * * LDAB (input) INTEGER * The leading dimension of the array AB. LDAB >= KD+1. * * S (output) DOUBLE PRECISION array, dimension (N) * The scale factors for A. * * SCOND (input) DOUBLE PRECISION * Ratio of the smallest S(i) to the largest S(i). * * AMAX (input) DOUBLE PRECISION * Absolute value of largest matrix entry. * * EQUED (output) CHARACTER*1 * Specifies whether or not equilibration was done. * = 'N': No equilibration. * = 'Y': Equilibration was done, i.e., A has been replaced by * diag(S) * A * diag(S). * * Internal Parameters * =================== * * THRESH is a threshold value used to decide if scaling should be done * based on the ratio of the scaling factors. If SCOND < THRESH, * scaling is done. * * LARGE and SMALL are threshold values used to decide if scaling should * be done based on the absolute size of the largest matrix element. * If AMAX > LARGE or AMAX < SMALL, scaling is done. * * ===================================================================== * * .. Parameters ..


Constructor Summary
DLAQSB()
           
 
Method Summary
static void DLAQSB(java.lang.String uplo, int n, int kd, double[][] ab, double[] s, double scond, double amax, StringW equed)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DLAQSB

public DLAQSB()
Method Detail

DLAQSB

public static void DLAQSB(java.lang.String uplo,
                          int n,
                          int kd,
                          double[][] ab,
                          double[] s,
                          double scond,
                          double amax,
                          StringW equed)