fisher1

代码说明：

  这是模式识别中常用的Fisher分类准则的函数，适用于样本类别为两类的情形。返回值是最佳投影方向和投影后的分类阈值。(This is a function of pattern recognition used Fisher classification criteria applicable to the category of the sample for the two types of situation. The return value is the best projection direction and projection classification threshold.)