给定若干两类二维的样本，用基于Fisher准则的方法投影到一维，求最佳投影方向，并画出图形。提示：即用以下矩阵的最大特征根对应的特征向量作为投影方向： -Given the number of samples of the two types of two-dimensional and one-dimensional projection method based on Fisher criterion to seek the best projection direction, and dr