Aai wrote:
>
>
>
> Hallo Devon McCormick, je schreef op 07-01-10 19:50:
>> It is an interesting picture but the pseudo-code falls short of fully
>> describing the alogrithm. The core of it is as follows (where "counter"
>> is
>> a prime):
>>
>> let x = mod(counter,11);
>>
>> if(x=1) move position up;
>> else if(x=2) move position down;
>> else if(x=3) move position right;
>> else if(x=4) move position left;
>> else if(x=5) move position up;
>>
>> increment colour of pixel at position;
>>
>> Besides illustrating the unnecessary wordiness of even conventional
>> pseudo-code, it fails to specify what happens for the cases where x has
>> the
>> values six through ten (and zero).
>>
>>
> You're right. This is my interpretation:
>
> NB. nomove up down right left ..
> dr=: 0 0, 0 1, 0 _1, 1 0, _1 0, 0 0, 0 0, 0 0, 0 0, 0 0,: 0 0
>
For x=5, it should go up, ie:
dr=: 0 0, 0 1, 0 _1, 1 0, _1 0, 0 1, 0 0, 0 0, 0 0, 0 0,: 0 0
> primenebulaP=: 3 : 0
> d=. ({.,#)/.~+/\ {&dr 11|p: i.y NB. scan left +/ on movement steps
> NB. normalize coordinates to upper right quadrant and calculate size
> 'gx gy '=. >: >./ XY=.(2{."1 d) -"1 {.~&2 <./ d
> smoutput (": gx),' x ', ": gy NB. show picture size
> viewmat (2{"1 d) (<"1 XY) } 0$~ gx, gy
> )
>
>
>
>
>> On Thu, Jan 7, 2010 at 11:39 AM, Aai <[email protected]> wrote:
>>
>>
>>> If you haven't this before: an intriguing picture of prime number
>>> distribution.
>>>
>>> http://yoyo.cc.monash.edu.au/~bunyip/primes/2dPrimes.htm<http://yoyo.cc.monash.edu.au/%7Ebunyip/primes/2dPrimes.htm>
>>>
>>> --
>>> Met vriendelijke groet,
>>> =@@i
>>>
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>
>>>
>>
>>
>>
>
> --
> Met vriendelijke groet,
> =@@i
>
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