Hi Bob
Thank you very much!
Bo.

    Den søndag den 14. marts 2021 20.52.23 CET skrev 'robert therriault' via 
Programming <[email protected]>:  
 
 Hi Bo,

By hand I came up with

  h=. (i ^ [: - [) * (i=.i.9) !~ ]
  6 h 4
0 0 0 0 0.000244141 0.00032 0.000321502 0.000297495 0.000267029

which works, but I prefer to separate out the constant under the separate name 
of int, to make the N V V a bit more clear in the dyadic forks
  int=. i. 9
  h1=. (int ^ [: - [) * int !~ ]
  6 h1 4
0 0 0 0 0.000244141 0.00032 0.000321502 0.000297495 0.000267029

Long story short, for me 13 : is useful, but it is not always correct and I 
find that in going from explicit to tacit manually, I learn a lot more about 
the structure of the verb than if I just apply 13 :

Cheers, bob
  

> On Mar 14, 2021, at 11:11, 'Bo Jacoby' via Programming 
> <[email protected]> wrote:
> 
> f=. 4 : '(i^-x)*y!i=.i.9' NB. some program

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