Module SNLASO in LASO

• LASO Information

• Components
  • Documentation from NETLIB
  • Example from NETLIB
  • Fullsource from NETLIB
  • Source from NETLIB

SNLASO

 
Computes a few eigenvalues and eigenvectors at one end of the spectrum of a large
sparse symmetric matrix. Based on the block Lanczos algorithm with selective
orthogonalization to compute Rayleigh-Ritz approximations to eigenpairs.
 
Classes  :  D4a7 . Sparse matrix eigenvalue problems
            D4a1 . Real symmetric matrix eigenvalue problems
 
Type     : Fortran subroutine in LASO package.
Access   : Some uses prohibited. Portable.
Precision: Single.
 
Usage    : CALL SNLASO(OP, IOVECT, N, NVAL, NFIG, NPERM, NMVAL, VAL, NMVEC,
           VEC, NBLOCK, MAXOP, MAXJ, WORK, IND, IERR)
 
Details  : Documentation Example Fullsource Source
Sites    : (1) NETLIB
 

Implementation of SNLASO from LASO on NETLIB

 
NETLIB:    Public access repository, The University of Tennessee at
           Knoxville and Bell Laboratories
 
Precision: Single. (Double: DNLASO)
 
You may access components from NETLIB outside GAMS as follows.
 
   Documentation: echo 'send doc from laso' | mail netlib@ornl.gov
   Example      : echo 'send lanczos3 from laso' | mail netlib@ornl.gov
   Source       : echo "send only snlaso from laso" | mail netlib@ornl.gov
   Fullsource   : echo "send snlaso from laso" | mail netlib@ornl.gov