该程序代码我不知道怎么用，是一个画等值线的程序代码，代码来源于长江大学李文华和张群龙老师，但是我发现我在借用该程序读入txt文件时出现了问题，在执行循环语句时出现了索引越界，不知道怎么处理了。我是matlab小白，希望有老师能指教一下(The program code I do not know how to use, is a painting contour program code from the Yangtze River University, Li Wenhua and Zhang Qunlong teacher, but I found that I borrow the program to read the txt file when a problem occurs in the implementation of the cycle Statement when the index out of bounds, do not know how to deal with. I am MATLAB beginner, I hope a teacher can advise)