org.netlib.lapack
Class Sggbak

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

public class Sggbak
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 * ======= * * SGGBAK forms the right or left eigenvectors of a real generalized * eigenvalue problem A*x = lambda*B*x, by backward transformation on * the computed eigenvectors of the balanced pair of matrices output by * SGGBAL. * * Arguments * ========= * * JOB (input) CHARACTER*1 * Specifies the type of backward transformation required: * = 'N': do nothing, return immediately; * = 'P': do backward transformation for permutation only; * = 'S': do backward transformation for scaling only; * = 'B': do backward transformations for both permutation and * scaling. * JOB must be the same as the argument JOB supplied to SGGBAL. * * SIDE (input) CHARACTER*1 * = 'R': V contains right eigenvectors; * = 'L': V contains left eigenvectors. * * N (input) INTEGER * The number of rows of the matrix V. N >= 0. * * ILO (input) INTEGER * IHI (input) INTEGER * The integers ILO and IHI determined by SGGBAL. * 1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0. * * LSCALE (input) REAL array, dimension (N) * Details of the permutations and/or scaling factors applied * to the left side of A and B, as returned by SGGBAL. * * RSCALE (input) REAL array, dimension (N) * Details of the permutations and/or scaling factors applied * to the right side of A and B, as returned by SGGBAL. * * M (input) INTEGER * The number of columns of the matrix V. M >= 0. * * V (input/output) REAL array, dimension (LDV,M) * On entry, the matrix of right or left eigenvectors to be * transformed, as returned by STGEVC. * On exit, V is overwritten by the transformed eigenvectors. * * LDV (input) INTEGER * The leading dimension of the matrix V. LDV >= max(1,N). * * INFO (output) INTEGER * = 0: successful exit. * < 0: if INFO = -i, the i-th argument had an illegal value. * * Further Details * =============== * * See R.C. Ward, Balancing the generalized eigenvalue problem, * SIAM J. Sci. Stat. Comp. 2 (1981), 141-152. * * ===================================================================== * * .. Local Scalars ..


Constructor Summary
Sggbak()
           
 
Method Summary
static void sggbak(java.lang.String job, java.lang.String side, int n, int ilo, int ihi, float[] lscale, int _lscale_offset, float[] rscale, int _rscale_offset, int m, float[] v, int _v_offset, int ldv, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Sggbak

public Sggbak()
Method Detail

sggbak

public static void sggbak(java.lang.String job,
                          java.lang.String side,
                          int n,
                          int ilo,
                          int ihi,
                          float[] lscale,
                          int _lscale_offset,
                          float[] rscale,
                          int _rscale_offset,
                          int m,
                          float[] v,
                          int _v_offset,
                          int ldv,
                          intW info)