Behavior of Part inside Function

问题

The following gives some strange "Part" warnings

Clear[f];
f = Function[{x}, x[[1]] == x[[2]]]

However if I execute the second line again, it works without warnings, any idea what's going on?

回答1:

Are you sure? I don't see any warnings in version 7.0.1:

In[1]:= Clear[f];
        f=Function[{x},x[[1]]==x[[2]]]

Out[2]= Function[{x},x[[1]]==x[[2]]]

来源：https://stackoverflow.com/questions/4093657/behavior-of-part-inside-function