/*
 * Copyright (c) 2005-2017 National Technology & Engineering Solutions
 * of Sandia, LLC (NTESS).  Under the terms of Contract DE-NA0003525 with
 * NTESS, the U.S. Government retains certain rights in this software.
 *
 * 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 NTESS 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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS 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.
 *
 */

#include "structs.h" // for vtx_data
#include <math.h>    // for sqrt

void makevwsqrt(double *vwsqrt, struct vtx_data **graph, int nvtxs)
/* Make vector of square roots of vertex weights. */
/* vector returned */
/* graph data structure */
/* number of vertices in graph */
{
  extern int     NSQRTS; /* number of sqrts already computed */
  extern double *SQRTS;  /* values computed */
  int            vwgt;   /* vertex weight */
  int            i;      /* loop counter */

  for (i = 1; i <= nvtxs; i++) {
    vwgt = graph[i]->vwgt;
    if (vwgt <= NSQRTS) {
      vwsqrt[i] = SQRTS[vwgt];
    }
    else {
      vwsqrt[i] = sqrt((double)vwgt);
    }
  }
}

/* Extract the subgraph vwsqrt values */
void make_subvector(double *vec, double *subvec, int subnvtxs, int *loc2glob)
/* vector for all vertices */
/* vector for vertices in subgraph */
/* number of vtxs in subgraph */
/* subgraph -> graph numbering map */
{
  int i;

  for (i = 1; i <= subnvtxs; i++) {
    ++subvec;
    (*subvec) = vec[loc2glob[i]];
  }
}
