Computes eigenvalues of symmetric tridiagonal matrix using implicit QL method. Eigenvectors may be computed later. Classes : D4a5 . Tridiagonal matrix eigenvalue problems D4c2a . Compute eigenvalues of tridiagonal matrix Type : Fortran subroutine in SEISPACK package. Access : Public domain. Portable. Precision: Single. Note : Implementations vary among sites. Usage : CALL IMTQLV(N, D, E, E2, W, IND, IERR, RV1) Details : Fullsource Source Sites : (1) ARNO (2) NETLIB
ARNO: Silicon Graphics Origin 2000, National Institute of Standards and Technology (NIST), Gaithersburg, MD. Available to NIST staff. Precision: Single. Those logged in to arno.nist.gov or amur.nist.gov may access this module as follows. Access : f77 -o prog prog.f -lcomplib.sgimath (Note: prepend s to routine name in call) Documentation: man simtqlv
NETLIB: Public access repository, The University of Tennessee at Knoxville and Bell Laboratories Precision: Single. Note : Double precision version available in NETLIB package EISPACK. You may access components from NETLIB outside GAMS as follows. Source : echo "send only imtqlv from seispack" | mail netlib@ornl.gov Fullsource : echo "send imtqlv from seispack" | mail netlib@ornl.gov
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