[R] How to take ID of number > 7.

[Yellow]

I figured out something new that I would like to see if I can do this more
easy with R then Excel. 

I have these huge files with data. 
For example: 

DataFile.csv 
ID Name log2 
1 Fantasy 5.651 
2 New 7.60518 
3 Finding 8.9532 
4 Looeka -0.248652 
5 Vani 0.3548 

With like header1: ID, header 2: Name, header 3: log2 

Now I need to get the $ID out who have a &log2 value higher then 7. 

I know ho to grab the $log2 values with 7+ numbers. 

Log2HigherSeven = DataFile$log2 [ DataFile$log2 >= 7]  

But how can I take thise ID numbers also? 

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