r - Keeping trailing zeros -

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In R, I want to keep behind zero. For example, if I type 

  round (5.2, 3)   
 I should output the output to 5.200.  
 Can you help me   
 
 
 if it is for printing purposes ,  sprintf  is what you are doing later:  
  & gt; See  sprintf  for formatting details. "

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