source: trunk/src/gslapi_utility.cc @ 259

Last change on this file since 259 was 259, checked in by Jari Häkkinen, 17 years ago

Moved out shuffle from vecotr class.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 944 bytes
Line 
1// $Id: gslapi_utility.cc 259 2005-03-04 01:09:55Z jari $
2
3#include "gslapi_utility.h"
4#include <utility>
5
6#include "random_singleton.h"
7#include "vector.h"
8
9
10namespace theplu {
11namespace gslapi {
12
13
14  std::pair<size_t,
15            size_t> minmax_index(const vector& vec,
16                                 const std::vector<size_t>& subset)
17  {
18    size_t min_index = subset[0];
19    size_t max_index = subset[0];
20    for (unsigned int i=1; i<subset.size(); i++) {
21      if (vec[subset[i]] < vec[min_index])
22        min_index = subset[i];
23      else if (vec[subset[i]] > vec[max_index])
24        max_index = subset[i];
25    }
26    return std::pair<size_t,size_t>(min_index, max_index);
27  }
28
29
30
31  void shuffle(vector& invec)
32  {
33    vector vec(invec);
34    theplu::cpptools::random_singleton* 
35      rnd=theplu::cpptools::random_singleton::get_instance();
36    for (size_t i=0; i<vec.size(); i++){
37      size_t index = rnd->get_uniform_int(vec.size()-i);
38      invec[i]=vec(index);
39      vec(index)=vec(vec.size()-i-1);
40    }
41  }
42
43}} // of namespace gslapi and namespace thep
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