Summary function - display head and tail in a single data.frame
1  | 
x | 
 A matrix or data frame or free text  | 
hlength | 
 The number of lines at the beginning to show  | 
tlength | 
 The number of lines at the end to show  | 
digits | 
 Round off the data to digits  | 
ellipsis | 
 separate the head and tail with dots  | 
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