Computes eigenvalues of symmetric tridiagonal matrix using implicit QL method. Classes : D4a5 . Tridiagonal matrix eigenvalue problems D4c2a . Compute eigenvalues of tridiagonal matrix Type : Fortran subroutine in EISPACK package. Access : Public domain. Portable. Precision: Double. Note : Implementations vary among sites. Usage : CALL IMTQL1(N, D, E, IERR) 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: Double. Note : Single precision version obtained by prepending s to name in call. 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 Documentation: man imtql1
NETLIB: Public access repository, The University of Tennessee at Knoxville and Bell Laboratories Precision: Double. Note : Single precision version available in NETLIB package SEISPACK. You may access components from NETLIB outside GAMS as follows. Source : echo "send only imtql1 from eispack" | mail netlib@ornl.gov Fullsource : echo "send imtql1 from eispack" | mail netlib@ornl.gov
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