How to initialize boost::random::discrete_distribution using std::vector?

风流意气都作罢 提交于 2019-11-30 04:38:57

问题


I would like to initialize boost::random::discrete_distribution with an std::vector<double>.

My problem is that if I initialize it with an array, like in the official example:

double probabilities[] = {
    0.5, 0.1, 0.1, 0.1, 0.1, 0.1
};
boost::random::discrete_distribution<> dist(probabilities);

then it works perfectly.

However if I initialize it with a std::vector, then it behaves like if it has only one element with probability 1.0.

Can you tell me what is the right way of initializing a boost::random::discrete_distribution<> with a vector?


回答1:


The class seems to have a constructor that takes an iterator range. This would be used with a vector like this:

std::vector<double> probs = ...;
boost::random::discrete_distribution<> dist(probs.begin(), probs.end());


来源:https://stackoverflow.com/questions/7904132/how-to-initialize-boostrandomdiscrete-distribution-using-stdvector

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