subset - Boolean operators and which() function in R -

I have a data frame, and I want to subscribe by selecting all the rows that correspond to a condition on the factor < Value for Code> Year :

  subset_df < - df [(which (df $ year <1972) || (df $ year> '1982')),]   
 My problem is that Returns the whole dataframe,  df  from the above line.  
 Forgive me if this is very basic or simple, but I do not know where the fault is.  
 I suspect that  ||  is something I do not understand, or my second theory is that  arr.ind = T  plays a role either, or  The nature of ()  function is slightly more complex because I think it is.  
 If someone has any insights, I would appreciate it very much. Thanks for your time.  
 PS: Yes, it works as expected and gives the right subset; That is, there is no flaw in my dataframe:  
  test_df & lt; - df [(which (df $ year <1972 ')),]   
 As it is equivalent to 1982   
 
 
 Note that you can read from the helpfile (see ? "|" ):  
 
 for |, & amp; And for a logical or raw vector xor ... and ... for ||, & amp; Amp; And ITRU, a length-a logical vector.   
 So you have your  ||  to  can change  and I think that    
  subset_df