[R] use a data frame whose name is stored as a string variable?

[Seth]

Hi,
Let's say I have a data frame (called "example") with numeric values stored
(columns V1 and V2).  I also have a string variable storing this name

x1<-"example"

Is there a way to use the variable x so that R knows that I want the
specified action to occur on the data frame?  For example, summary (x) would
return a summary of the data frame?

I am considering this because I need to compare many data frames within 2
nested for loops.  In the first iteration of the loop I could concatenate x
and 1 and then use it to represent the data frame.  I'm open to a better
solution.  Thanks, Seth Myers 
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