text: /* Copyright (c) 2010, RWTH Aachen University
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or 
   * without modification, are permitted provided that the following
   * conditions are met:
   *   * Redistributions of source code must retain the above 
   *     copyright notice, this list of conditions and the following
   *     disclaimer.
   *   * Redistributions in binary form must reproduce the above 
   *     copyright notice, this list of conditions and the following 
   *     disclaimer in the documentation and/or other materials 
   *     provided with the distribution.
   *   * Neither the name of the RWTH Aachen University nor the
   *     names of its contributors may be used to endorse or promote 
   *     products derived from this software without specific prior 
   *     written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RWTH 
   * AACHEN UNIVERSITY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
   * SUCH DAMAGE.
   *
   * Coded by Matthias Petschow (petschow@aices.rwth-aachen.de),
   * August 2010, Version 0.6
   *
   * This code was the result of a collaboration between 
   * Matthias Petschow and Paolo Bientinesi. When you use this 
   * code, kindly reference a paper related to this work.
   *
   */
  
  #ifndef PPLARRE_H
  #define PPLARRE_H
  
  #include "global.h"
  #include "structs.h"
  
  /*
   * Computing the eigenvalues and of a symmetric tridiagonal matrix 
   * by bisection implemented in LAPACK routines 'dlarrd' and 'dlarrb'.
   *
   * Note: this implementation is here is not really optimized in
   * terms of performance and memory usage.
   */
  int plarre(proc_t *procinfo, char *jobz, char *range, in_t *Dstruct, 
  	       val_t *Wstruct, tol_t *tolstruct, int *nzp, int *offsetp);
  
  /* Perturb the initial root representation by "1 + eps*RAND_FACTOR*rand"; 
   * default: 8.0 */ 
  #define RAND_FACTOR         8.0 
  
  /* Fudge of shift, to get root rrr; default: 2.0 */
  #define FUDGE_FACTOR        2.0 
  
  #endif
  
  