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Some improvements from Jeremiah Willcock

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[SVN r32743]
This commit is contained in:
Douglas Gregor
2006-02-08 16:15:16 +00:00
parent 3f81217fad
commit 70bbfe664b
1 changed files with 8 additions and 6 deletions
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14
include/boost/graph/plod_generator.hpp
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@@ -15,6 +15,7 @@
#include <boost/shared_ptr.hpp>
#include <boost/graph/graph_traits.hpp>
#include <vector>
#include <map>
#include <cmath>
namespace boost {
@@ -37,18 +38,19 @@ namespace boost {
plod_iterator(RandomGenerator& gen, std::size_t n,
double alpha, double beta, bool allow_self_loops = false)
: gen(&gen), n(n), out_degrees(new out_degrees_t(n)),
: gen(&gen), n(n), out_degrees(new out_degrees_t),
degrees_left(0), allow_self_loops(allow_self_loops)
{
using std::pow;
uniform_int<std::size_t> x(0, n-1);
for (out_degrees_t::iterator i = out_degrees->begin();
i != out_degrees->end(); ++i) {
for (std::size_t i = 0; i != n; ++i) {
std::size_t xv = x(gen);
i->first = i - out_degrees->begin();
i->second = (xv == 0? 0 : std::size_t(beta * pow(xv, -alpha)));
degrees_left += i->second;
std::size_t degree = (xv == 0? 0 : std::size_t(beta * pow(xv, -alpha)));
if (degree != 0) {
out_degrees->push_back(std::make_pair(i, degree));
}
degrees_left += degree;
}
next(directed_category());