org.netlib.lapack
Class Slaqsb

java.lang.Object
  org.netlib.lapack.Slaqsb

public class Slaqsb
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
 *  =======
 *
 *  SLAQSB 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) REAL 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) REAL array, dimension (N)
 *          The scale factors for A.
 *
 *  SCOND   (input) REAL
 *          Ratio of the smallest S(i) to the largest S(i).
 *
 *  AMAX    (input) REAL
 *          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 *          = 'Y':  Equilibration was done, i.e., A has been replaced by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

Slaqsb()

Method Summary

static void

slaqsb(java.lang.String uplo, int n, int kd, float[] ab, int _ab_offset, int ldab, float[] s, int _s_offset, float scond, float amax, StringW equed)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Slaqsb

public Slaqsb()

Method Detail

slaqsb

public static void slaqsb(java.lang.String uplo,
                          int n,
                          int kd,
                          float[] ab,
                          int _ab_offset,
                          int ldab,
                          float[] s,
                          int _s_offset,
                          float scond,
                          float amax,
                          StringW equed)