Dear R-friends,
   
  I have to simple questions. First I would like to exclude some columns from a dataframe and after I need select rows that satisfy some conditions. 
  My data frame looks like
   
  Region Species Bodysize Weigth Age
  Africa  Sp1 10.2 20 2
  Africa  Sp2 12.2 12 2
  Africa  Sp3 15.3 18 3
  Africa  Sp4 11.5 40 4
  Brazil  Sp1 10.2 40 3
  Brazil  Sp2 22.2 32 2
  Brazil  Sp3 12.3 28 3
  Brazil  Sp4 21.5 30 5
   
  And I need for example only "columns" Bodysize Weigth and Age when Region=="Brazil" AND Species=="Sp2" AND Age>=3
   
  In fact my dataset is greater than this, but it is just a example.
   
  Thanks for all helps,
   
  Kind regards, 
   
  Miltinho

 		
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