A mean is a comparison with rules about two numbers. However, I get a different answer than Bo. I have no idea what the answer should be. Interesting problem.
lm=: 13 : 'y*l x%y' lm~ >:i.10 0 0 0 0 0 0 0 0 0 0 5 lm 20 10.8202 lm2=: 13 :'(|x-y)%^.|x-y' lm2~ >:i.10 0 0 0 0 0 0 0 0 0 0 5 lm2 20 5.53904 lm ] * [: l % lm2 ([: | -) % [: ^. [: | - Linda -----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Bo Jacoby Sent: Monday, April 21, 2014 12:48 AM To: programm...@jsoftware.com Subject: Re: [Jprogramming] Logarithmic Mean Try this: l=. 13 : '(<:y)%^.y' lm=. 13 : 'y*l x%y' f. NB. logarithmic mean lm ] * [: (<: % ^.) % 3 lm 3.000002 3 3 lm 3.00002 3.00001 Thanks. Bo. Den 2:04 mandag den 21. april 2014 skrev Raul Miller <rauldmil...@gmail.com>: On Sun, Apr 20, 2014 at 7:08 PM, Henry Rich <henryhr...@nc.rr.com> wrote: >> More exact equality isn't enough - as you can see from the example, it >> calculates a mean of 2.7 when 3 is the right answer. The problem there is >> roundoff error I expect. > >I doubt the numbers I am working with would have even 10 digits of >accuracy, so I'm actually not too worried. > >Thanks, > > >-- >Raul >---------------------------------------------------------------------- >For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
