[R] question about string to boor?

[song_gpqg]

Hello!
So I am handling this problem with some arrays grp1-grp7, I want to write a
loop to avoid tedious work, but I don't know how to transform string to
boor? 
For example I used 
i=1 
paste("grp",i, sep="")
I only got "grp1" instead of grp1, which can't be manipulate using mean() or
other function. 

I am not sure if I make myself clear...
THANKS!!!!

Nellie

 

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