Limiting the number of decimals in a dataframe (R) -

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I import a data frame, when I want to limit the number of decades column in my .txt input "value "In each row is 16 decimals. My dataframe looks like this: 

  value 0.202021561664556 0.202021561664556 0.202021561664556 0.202021561664556 ... my expected dataframe  
  value 0.20202156 0.20202156 0.20202156 0.20202156 ...   
 Actual input (DF) that does not work:  
  DF < - "NE001358.Log.R.Ratio -0.0970369274475688 0.131893549586039 0.0629266495860389 0.299559132381831 -0.0128804337656807 0.0639743960526874 0.0271669351886552 0.322395363972391 0.179591292893632" DF & lt;  is.num  is  TRUE  numeric column and  FALSE  otherwise we apply the  round  in the numeric column:  > 
  is.num & lt; - sapply (df, is.numeric) df [is.num]  
  Print (DF, Issue = 8)

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