[R] select from data frame

Andras Farkas motyocska at yahoo.com
Sat Jul 15 13:01:06 CEST 2017

Dear All,

wonder if you could please assist with the following 


from this data frame the goal is to extract the value of 3 from the ID column based on the logic that the ID=3 in the data frame has NO row that would pair 3 with either "B", AND/OR "C" in the samples column...

much appreciate your help...


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