熟悉matlab的人都会很清楚matlab中的feval()函数没法对匿名函数进行运算，当然更不可能执行当前路径之外或者说搜索路径之外的函数。还有eval只能执行字符串命令。

9 q2 u8 e" L& Y, E Z8 {然而evalf解决了上面的所有问题 -Matlab person familiar with the very clear matlab in feval () function can not be anonymous function of computing, of course, impossible to implement outside of the current path or the path outside the search function. There can only run eval command string. 9 q2 u8 e　L