attach provides a copy of rather than aliases to the variables within a
data frame.
d = data.frame(x=0)
attach(d)
x
# 0, from the attached copy of d
x = 1
x
# 1, from the global anvironment
d$x
# 0, from d
x <<- 2
x
# 1, from the global environment
d$x
# 0, from d
get('x', pos=2)
# 2, from the
Hello,
suppose I have a data frame:
> mat
id age
1 NA NA
2 NA NA
3 NA NA
4 NA NA
5 NA NA
Then I attach the data frame:
> attach(mat)
I assign some new values...
> id <<- sample(100,5)
> age <<- rnorm(5,mean=30)
Then I want to create a new data frame from the variables id and age which
2 matches
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