public static List <T> RandomPickN(List <T> dataArray, uint count)//等概率
{
if (count == 0)
{
return(new List <T>());
}
if (dataArray.Count <= count)//全部掉出
{
return(dataArray);
}
NLRandomPicker <T> picker = new NLRandomPicker <T>();
for (int i = 0; i < dataArray.Count; i++)
{
picker.AddData(dataArray[i], 1);
}
return(new List <T>(picker.RandomPickN(count)));
}
/// <summary>
/// 从dataArray数组中按照概率rateArray，随机选出count个物件
/// </summary>
/// <param name="dataArray">样本数组</param>
/// <param name="rateArray">概率数组</param>
/// <param name="count">选取数</param>
/// <returns>返回选取的物件</returns>
public static T[] RandomPickN(T[] dataArray, float[] rateArray, uint count)
{
if (dataArray.Length != rateArray.Length || count == 0)
{
return(new T[0]);
}
if (dataArray.Length <= count)//全部掉出
{
return(dataArray);
}
//todo 考虑下n选m，时m>n/2，做减法
NLRandomPicker <T> picker = new NLRandomPicker <T>();
for (int i = 0; i < dataArray.Length; i++)
{
picker.AddData(dataArray[i], rateArray[i]);
}
return(picker.RandomPickN(count));
}
/// <summary>
/// 从dataArray数组中以等概率随机选出count个物件
/// </summary>
/// <param name="dataArray">样本数组</param>
/// <param name="count">选取数</param>
/// <returns>返回选取的物件</returns>
public static T[] RandomPickN(T[] dataArray, uint count)//等概率
{
if (count == 0)
{
return(new T[0]);
}
if (dataArray.Length <= count)//全部掉出
{
return(dataArray);
}
NLRandomPicker <T> picker = new NLRandomPicker <T>();
for (int i = 0; i < dataArray.Length; i++)
{
picker.AddData(dataArray[i], 1);
}
return(picker.RandomPickN(count));
}
