/*
 * Copyright(C) 1999-2020 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.
 *
 * See packages/seacas/LICENSE for details
 */

#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]];
  }
}