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
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
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