Isomap 算法 出现了点问题。麻烦大家~谢谢

happyjyc888

1 % The data and corresponding class labels are stored in data.mat.
请问‘corresponding class labels’ 具体什么意思？

2 还有运行后出现如下错误：
??? At compilation "data" was determined to be variable. As a variable, it is uninitialized, but function "data" is now in context. In MATLAB 7, you cannot use the same name in a single function as both a function and a variable.

Error in ==> sIsomap at 16
D=distance(data, labels, alpha);
怎样修改，谢谢大家~