[R] Replace columns in a data.frame randomly splitted

[agent dunham]

Dear community, 

 I'm working with the data.frame attached (
http://r.789695.n4.nabble.com/file/n4122926/df1.xls df1.xls ), let's call it
df1.
 I typed:  df1<- read.xls("C:/... dir .../df1.xls",colNames= TRUE, rowNames=
TRUE)   

 Then I splited randomly df1 using splitdf function
(http://gettinggeneticsdone.blogspot.com/2011/03/splitting-  
dataset-revisited-keeping.html)
 
 So now, I have df1 divided in another 2 dataframes: trainset  and testset.
(They both have the same row  names and column names as df1)

 I'd like to change df1$v1 and df1$v2 values in the trainset  and testset by
the ones in df2 ( http://r.789695.n4.nabble.com/file/n4122926/df2.xls
df2.xls )

 How can I explain R to identify in trainset/testset$v1 and $v2 the rownames 
and replace the values by the corresponding ones in df2?

Thanks in advance, 

user at host.com

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