org.netlib.lapack
Class Slaqgb

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

public class Slaqgb
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 * ======= * * SLAQGB equilibrates a general M by N band matrix A with KL * subdiagonals and KU superdiagonals using the row and scaling factors * in the vectors R and C. * * Arguments * ========= * * 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. * * KL (input) INTEGER * The number of subdiagonals within the band of A. KL >= 0. * * KU (input) INTEGER * The number of superdiagonals within the band of A. KU >= 0. * * AB (input/output) REAL array, dimension (LDAB,N) * On entry, the matrix A in band storage, 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, the equilibrated matrix, in the same storage format * as A. See EQUED for the form of the equilibrated matrix. * * LDAB (input) INTEGER * The leading dimension of the array AB. LDA >= KL+KU+1. * * R (output) REAL array, dimension (M) * The row scale factors for A. * * C (output) REAL array, dimension (N) * The column scale factors for A. * * ROWCND (output) REAL * Ratio of the smallest R(i) to the largest R(i). * * COLCND (output) REAL * Ratio of the smallest C(i) to the largest C(i). * * AMAX (input) REAL * Absolute value of largest matrix entry. * * EQUED (output) CHARACTER*1 * Specifies the form of equilibration that was done. * = 'N': No equilibration * = 'R': Row equilibration, i.e., A has been premultiplied by * diag(R). * = 'C': Column equilibration, i.e., A has been postmultiplied * by diag(C). * = 'B': Both row and column equilibration, i.e., A has been * replaced by diag(R) * A * diag(C). * * Internal Parameters * =================== * * THRESH is a threshold value used to decide if row or column scaling * should be done based on the ratio of the row or column scaling * factors. If ROWCND < THRESH, row scaling is done, and if * COLCND < THRESH, column scaling is done. * * LARGE and SMALL are threshold values used to decide if row scaling * should be done based on the absolute size of the largest matrix * element. If AMAX > LARGE or AMAX < SMALL, row scaling is done. * * ===================================================================== * * .. Parameters ..


Constructor Summary
Slaqgb()
           
 
Method Summary
static void slaqgb(int m, int n, int kl, int ku, float[] ab, int _ab_offset, int ldab, float[] r, int _r_offset, float[] c, int _c_offset, float rowcnd, float colcnd, float amax, StringW equed)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Slaqgb

public Slaqgb()
Method Detail

slaqgb

public static void slaqgb(int m,
                          int n,
                          int kl,
                          int ku,
                          float[] ab,
                          int _ab_offset,
                          int ldab,
                          float[] r,
                          int _r_offset,
                          float[] c,
                          int _c_offset,
                          float rowcnd,
                          float colcnd,
                          float amax,
                          StringW equed)