wow
Also, one may propose a favorite sequence. I have two pairs to offer. The
first pair is almost too easy. The second pair is harder but you may get it if
you understand the first pair. Provide definitions for the verb pair iii0,
iii1
and the pair v0, v1 . Each verb generates takes from a sequence:
(iii0,.iii1) 10 NB. takes listed vertically
1 0
4 4
7 20
10 54
13 112
16 200
19 324
22 490
25 704
28 972
(v0,.v1) 10
1 0
6 _6
31 _32
76 _108
141 _384
226 _1250
331 _3456
456 _8232
601 _17408
766 _33534
If you use J to help figure these out, tell!
Roger Hui wrote:
> p:@(+/)@(i.!])@>@i.
>
> Why is it my favorite? The function does not contain
> any of the digits 0-9.
>
>
>
> ----- Original Message -----
> From: Kip Murray <[email protected]>
> Date: Monday, August 17, 2009 12:16
> Subject: Re: [Jprogramming] Takes from a mystery sequence
> To: Programming forum <[email protected]>
>
>> Part three: Propose your favorite
>>
>> Kip Murray wrote:
>>> Part two: If you used J to help you figure out the sequence, tell
>>>
>>> Kip Murray wrote:
>>>> Verb i. produces takes from the sequence of non-negative integers:
>>>>
>>>> i.20
>>>> 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
>>>> i.5
>>>> 0 1 2 3 4
>>>> 5 {. i.20
>>>> 0 1 2 3 4
>>>>
>>>> Verb s generates takes from a mystery sequence (no peeking in
>> Sloane, please)
>>>> s 13
>>>> 2 3 7 19 53 131 311 719 1619 3671 8161 17863 38873
>>>> s 5
>>>> 2 3 7 19 53
>>>> 5 {. s 13
>>>> 2 3 7 19 53
>>>>
>>>> Your mission, should you decide to accept it, is to provide a
>> definition for s .
>>>> As always, these instructions will
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