随机删除数据点

Question

我正在生成一个模型列表，以模拟每天每分钟收集一次的数据。 我想创建一些其他模型，并随机删除一些数据点。 有没有办法实现这种行为？ 下面是我的代码

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Text;
   using System.Threading.Tasks;
   using MathNet.Numerics;
   using MathNet.Numerics.Statistics;
  public void dataGenerator()
    {
        int hrs = 24;
        int minutes = 60;
        int samplesize = hrs * minutes; // this is one day worth of data, with data created every minute
        double mean = 50;
        double stdev = 1;
        int maxmodel = 10;

        List<double[]> models = new List<double[]>();
        List<double> modelaverage = new List<double>();
        List<double> modelvariance = new List<double>();

        // generating normal models with different mean / deviations 
        for (int i = 1; i <= maxmodel; i++)
        {
            //deviations are incremented by i, to create modles of different deviations, with every model having a different center by 2*i
            double[] model = Generate.Normal(samplesize, mean + 2*i, stdev * i);

            models.Add(model);
            modelaverage.Add(model.Average());
            modelvariance.Add(model.Variance());



        }
    }

Answer 1

只需添加以下代码（我认为这很容易解释）：

Random rnd = new Random();
int RandomRemoveCount = 10;
for (int i = 0; i < Math.Min(models.Count, RandomRemoveCount); i++)
{
    models.RemoveAt(rnd.Next(models.Count));
}

并将RandomRemoveCount更改为要删除的值。 Math.Min是为了确保您删除的内容不会超过实际数量。