检查样本空间中是否存在一个样本(来自PCA或其他聚类分析)

I have a 200 by 50 matrix, here 200 means 200 compounds (row) and 50 means 50 independent varialbes (column), and then I use the 200 * 50 matrix to do cluster analysis (e.g. k-mean etc.), I can get a plot to show the distributions for these 2000 compounds.I have a 200 by 50 matrix, here 200 means 200 c