--- 
:name: dlarrr
:md5sum: aaf8ba40b9ad39ee862cbb6d215c9186
:category: :subroutine
:arguments: 
- n: 
    :type: integer
    :intent: input
- d: 
    :type: doublereal
    :intent: input
    :dims: 
    - n
- e: 
    :type: doublereal
    :intent: input/output
    :dims: 
    - n
- info: 
    :type: integer
    :intent: output
:substitutions: {}

:fortran_help: "      SUBROUTINE DLARRR( N, D, E, INFO )\n\n\
  *  Purpose\n\
  *  =======\n\
  *\n\
  *  Perform tests to decide whether the symmetric tridiagonal matrix T\n\
  *  warrants expensive computations which guarantee high relative accuracy\n\
  *  in the eigenvalues.\n\
  *\n\n\
  *  Arguments\n\
  *  =========\n\
  *\n\
  *  N       (input) INTEGER\n\
  *          The order of the matrix. N > 0.\n\
  *\n\
  *  D       (input) DOUBLE PRECISION array, dimension (N)\n\
  *          The N diagonal elements of the tridiagonal matrix T.\n\
  *\n\
  *  E       (input/output) DOUBLE PRECISION array, dimension (N)\n\
  *          On entry, the first (N-1) entries contain the subdiagonal\n\
  *          elements of the tridiagonal matrix T; E(N) is set to ZERO.\n\
  *\n\
  *  INFO    (output) INTEGER\n\
  *          INFO = 0(default) : the matrix warrants computations preserving\n\
  *                              relative accuracy.\n\
  *          INFO = 1          : the matrix warrants computations guaranteeing\n\
  *                              only absolute accuracy.\n\
  *\n\n\
  *  Further Details\n\
  *  ===============\n\
  *\n\
  *  Based on contributions by\n\
  *     Beresford Parlett, University of California, Berkeley, USA\n\
  *     Jim Demmel, University of California, Berkeley, USA\n\
  *     Inderjit Dhillon, University of Texas, Austin, USA\n\
  *     Osni Marques, LBNL/NERSC, USA\n\
  *     Christof Voemel, University of California, Berkeley, USA\n\
  *\n\
  *  =====================================================================\n\
  *\n"
