It could just be that the poster wanted to see a recursive version of
this problem (and one using ^:) so that he could learn how to apply
those methods to other problems that really needed them.
Henry Rich
On 9/29/2017 11:01 PM, Don Kelly wrote:
So it is a game- fair enough- it shows that in J there are more ways
than one to skin a cat. BUT does it really bring out the reason for a
language like J or APL? Does it bring out the power of J to make so
many things simpler and more elegant for the user? You have used APL
and so have I -and the benefit has been the ability to express a
solution to a problem-in APL it has bee explicit but in J there is a
choice and ,for some things, explicit is clearer and more
understandable -where for other things tacit J has advantages. I have
an explicit script for finding electric or magnetic fields in the
region of a powerline. This can involve some internal calls on a tacit
operation. The balance is dependent on the problem and the
preferences of the user.
Don
On 2017-09-28 4:41 PM, Erling Hellenäs wrote:
It's not better. Skip asked for a recursive version too so we gave
him one. Very complicated way to write a simple thing. Lol. /Erling
On 2017-09-29 01:24, Don Kelly wrote:
why is this better than the easy to read version that Roger Hui sent?
quote:
+/\4+i.10
4 9 15 22 30 39 49 60 72 85
unquote: This is also the way APL does it Sure it is fun to try
different ways such as below, just as it is fun to make a 1 liner to
generate a series for sin x. It is also nice to come back to a piece
of code written a year earlier and be able to recognize quickly what
it did. In the end- the simpler expression uses the power of J to do
it more neatly and faster Don Kelly
On 2017-09-28 1:02 PM, Xiao-Yong Jin wrote:
On Sep 28, 2017, at 2:45 PM, Erling Hellenäs
<[email protected]> wrote:
4 [`(] (] , [ + [: {: ]) [ $: [: <: ])@.(<) 8
4 9 15 22 30
Super!
4 [`(] (] , (+{:)) ($:<:) )@.< 8
/Erling
On 2017-09-28 20:33, Skip Cave wrote:
What is a good way to generate this sequence in J?
4,(4+5),(4+5+6),(4+5+6+7),(4+5+6+7+8)+.....
Show one way using i. and insert.
Show another way using recursion.
Skip
Skip Cave
Cave Consulting LLC
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