R: Count items in a nested list -


How do you count items in a nested list efficiently? For example, my title is a list of names: 

  header.names & lt; - Listings ("Post Unique References", "Name", "Grade (or Equivalent)", "Date", "Date"), List ("Name", "Organization", "Unit", "Senior Reporting "," Grade "," date "))   
 I want to calculate the number of times a header is generated  
 can be a simple approach  
  is required (str_count (str_count (unlist (header.names), "date"))   
 though:  
     
  •  "Name" should be a count of 2.  
  •  The count of "date" should also be generated 2 because every list is counted once.  
  •  The count "grade" should yield 1 - how does a non-exact search look like it produces 2?    
     
    



    
    

    


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