[Jprogramming] Recursive verbs

Tue Nov 27 17:38:10 UTC 2018

I like that solution. Here is another approach
  4 p.~(2&^@>: ,.~ _1r3 * 2&^@>: + _1&^)i. 10
7 15 29 59 117 235 469 939 1877 3755
I found this by composing the linear poly's and noting the constant 
terms satisfy a two step recursion with eigenvalues 2 and _1.
  lc=.({.@[+{:@[*{.@]),*&{:
  lc/\.(7$_1 2,:1 2)
_43 128
_21 64
_11 32
 _5 16
 _3  8
 _1  4
 _1  2
On 11/27/2018 11:06 AM, Raul Miller wrote:
> Sure, ... that's a bit bulkier than I prefer, but it works.
>> Here's another alternative:
>> evenodd=: , (_1 2,:_1 4)&p.@{:
> evenodd evenodd 4
> 4 7 15 29 59
>> Thanks,
>