[R] Creating dataframes

[Woida71]

I would like to create a certain number of dataframes out of one dataframe
where each of the dataframes
is related to a factor. This should be possible with a loop or a function,
as is very clumsy to do it manually
when there are quite a lot factors. 

For example having a dataframe called "exmpl":

Site	Value
1	12
1	15	
1	18
1	21	
1	12
1	13
2	15	
2	12
2	58
2	62
2	22
2	65
2	29
3	21
3	55
3	11
3	98

I would like to create 3 dataframes, where  
"exmpl_01" equals:
1	12
1	15	
1	18
1	21	
1	12
1	13

"exmpl_02" equals:
2	15	
2	12
2	58
2	62
2	22
2	65
2	29

"exmpl_03" equals:
3	21
3	55
3	11
3	98

Thanks for any help.
Walter

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