/// <summary>
/// return mean of samples with the same label
/// </summary>
/// <param name="label">label of samples</param>
/// <returns>return mean of samples with the same label</returns>
public Vector GetMeanOfDataWithLabel(double label)
{
List <Sample> samples = this.GetSamplesOfLabel(label);
return(Sample.GetXMeanOfSamples(samples));
}
