Dear R users,

I have a simple question on variable manipulation.
Imagine I have an object "OBJ" that has "toto" as one of its variables.
I would like to understand why if I do

 > varname <- "toto"

 >OBJ$varname                             returns no results

whereas

 > OBJ[varname]                            returns the column entitled 
"toto"


Thanks for your help.

Stéphane.

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