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Text File  |  1991-06-13  |  359b  |  12 lines
  1. ~.  (Verb)
  2.  
  3. NUB (_)  ~.y selects the nub of y, that is, all of its distinct items. For example:
  4.  
  5.       y            ~. y    
  6. ABC       ABC
  7. ABC       DEF
  8. DEF
  9.    ~.3       $~. 3
  10. 3         1
  11.  
  12. More precisely, the nub is obtained by selecting the leading item, suppressing from the argument all items tolerantly equal to it, selecting the leading remaining item, and so on.