> M<-data.frame(n1,n2,m)
> ls.str(pat="M")
M : 'data.frame': 1 obs. of 3 variables:
$ n1: num 10
$ n2: num 100
$ m : num 0.5
> ls.str(pat="M",max.level=-1)
错误于ls.str(pat = "M", max.level = -1) :
参数((max.level = -1)) 没有用
Who can tell me what's wrong with this code? According to the book
R for beginngers (Chinese), this code is ok.
Who can tell me?
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