[comp.lang.apl] J and index-origin question.

rrr@hpdmd48.boi.hp.com (Rudi Rynders) (12/04/90)

 I am running J on a PC clone and have just begun to
 explore J. One thing that puzzles me is that while
 the default seems to be an index origin of 0, like
 if :    alph=. 'abcdefghijklmnopqrstuvwxyz'
  then    2{alph    returns 'c'  whereas for negative values
  as in :    _2{alph   returns 'y'  it looks like
	 an index origin of 1 prevails.
 Anyhow is there an equivalent to APL's QuadIO<-1 in J?
 Thanks in advance.
       Rudi Rynders.

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