I use
steps
{.@] + -~/@] * [ %~ [: i. >:@[
5 steps 2 3
2 2.2 2.4 2.6 2.8 3
--Kip Murray
Sent from my iPad
> On Mar 21, 2014, at 9:29 AM, Pascal Jasmin <[email protected]> wrote:
>
> an alternate approach to increasing step size is:
>
> 2 ([ * [: i. ]) 5
> 0 2 4 6 8
>
> ----- Original Message -----
> From: Raul Miller <[email protected]>
> To: Programming forum <[email protected]>
> Cc:
> Sent: Friday, March 21, 2014 9:34:51 AM
> Subject: Re: [Jprogramming] A curious omission
>
> That's a good point. That ambiguity you called out would indeed be a
> problem.
>
> Meanwhile, the functionality which I was reaching for could be expressed as:
>
> (10 $ 2{. 1) # i. 10
> 0 2 4 6 8
>
> or, equivalently:
>
> 2 (i.@] #~ ] $ [ {. 1:) 10
> 0 2 4 6 8
>
> Or, better yet:
>
> 2 (i.@] #~ ] $ [ {. 1:) 11
> 0 2 4 6 8 10
>
> But what's a word to describe this issue of step size? I'd like to use it
> with thru:
>
> thru=: <./ + i.@(+ *)@-~
>
> 0 thru 10
> 0 1 2 3 4 5 6 7 8 9 10
>
> Perhaps:
> stepsize=: ] #~ $@] $ [ {. 1:
>
> 2 stepsize 0 thru 10
> 0 2 4 6 8 10
>
> 2 stepsize 10 thru _2
> 10 8 6 4 2 0 _2
>
> Of course, there's a limitation here. If I ask for a step size which clips
> off the ending point, I will not see it in my results. And, there's nothing
> really wrong with using i. directly. Still, this kind of thing can be fun
> to play with.
>
> Thanks,
>
> --
> Raul
>
>
>
> On Fri, Mar 21, 2014 at 9:11 AM, Pascal Jasmin <[email protected]>wrote:
>
>> exploring i: with j parameters is very impressive.
>>
>> it creates equal intervals from -xj to xj.
>>
>> even jy will include 0 in the interval list.
>>
>> i: 10j3
>> _10 _3.33333 3.33333 10
>> i: 10j4
>> _10 _5 0 5 10
>>
>> I can understand not including a i. definition, bc if you wanted
>>
>> 0 5 10
>>
>>
>> should you call i. 10j2 or i. 10j4 ?
>>
>> The latter keeps the mirror properties of i. and i:, but the result is 2
>> intervals instead of 4. It doesn't seem overwhelmingly difficult to filter
>> out the results of i: to get what you want. Odd jy params are interesting,
>> and might be lost with a definition for i. that strives for conceptual
>> simplicity relative to its y arguments rather than to i: reference.
>>
>>
>> ----- Original Message -----
>> From: Raul Miller <[email protected]>
>> To: Programming forum <[email protected]>
>> Cc:
>> Sent: Friday, March 21, 2014 8:06:23 AM
>> Subject: Re: [Jprogramming] A curious omission
>>
>> I was trying to draw a contrast between the domains of i. and i:
>>
>> Also, my use of !. (fit) was not meant to be ! (out of). I was talking
>> about potential language enhancements (which should focus on taking error
>> cases and re-using them for something that makes sense) and not about using
>> the language as it is now. Perhaps I should have used the chat forum, given
>> the subject matter?
>>
>> Thanks,
>>
>> --
>> Raul
>>
>>
>>
>> On Fri, Mar 21, 2014 at 5:09 AM, Linda Alvord <[email protected]
>>> wrote:
>>
>>> Perhaps you meant:
>>>
>>> i:2!10
>>> _45 _44 _43 _42 _41 _40 _39 _38 _37 _36 _35 _34 _33 _32 _31 _30 _29 _28
>> _27
>>> _26 _25 _24 _23 _22 _21 _20 _19 _18 _17 _16 _15 _14 _13 _12 _11 _10 _9 _8
>>> _7
>>> _6 _5 _4 _3 _2 _1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
>>> 22
>>> 23 24 25 26 27 28 29 30 31...
>>>
>>> Linda
>>> --
>>> ---Original Message-----
>>> From: [email protected]
>>> [mailto:[email protected]] On Behalf Of Raul
>> Miller
>>> Sent: Friday, March 21, 2014 2:22 AM
>>> To: Programming forum
>>> Subject: [Jprogramming] A curious omission
>>>
>>> i: 10j2
>>> _10 0 10
>>> i. 10j2
>>> |domain error
>>>
>>> Not quite sure why we can use complex numbers with i: but not i.
>>>
>>> Of course it might also be useful to specify the step size instead of the
>>> number of steps. But !. could be used for that:
>>>
>>> i.!.2]10
>>>
>>> |domain error
>>>
>>>
>>> Curious...
>>>
>>>
>>> --
>>>
>>> Raul
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>>>
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
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