请问各位大侠，下面的错误是什么原因啊？
> eyield<-read.table("eygap.dat",header=T)
Problem in count.fields(file = file, sep = sep, skip..: Couldn't open file "eyga
p.dat" for "r" (read): No such file or directory
Use traceback() to see the call stack
在此先谢谢各位大侠