I wonder why f=.4 : 'a$,y,.(a=.2$$y)$x' did not work. It was copied
directly from the J window. I just now pasted it from the email back
into J and it ran OK. I am using J6.02 under linux.
Ken Chakahwata wrote:
> Interesting -- I found I could extend the idea of "make matrix and rotate"
> as follows, (this time without "each", using appropriate verb ranks):
>
> g=. ([: - [: i. #) |."0 1 # {."0 ]
>
> the empty case works as well, so:
>
> $g 0$0
> 0 0
> $g''
> 0 0
>
> I found the dyad f below gives a domain error -- I tried to modify it, but
> didn’t get too far.
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Eldon Eller
> Sent: 13 October 2008 00:08
> To: Programming forum
> Subject: Re: [Jprogramming] diagonal arrays
>
> Or, dyadic:
>
> f=.4 : 'a$,y,.(a=.2$$y)$x'
>
> 0 f 2 3 5 7
> 2 0 0 0
> 0 3 0 0
> 0 0 5 0
> 0 0 0 7
> '-' f 'juytr'
> j----
> -u---
> --y--
> ---t-
> ----r
>
> Björn Helgason wrote:
>
>> f=: 3 : 0
>> ((#y),(#y))$ y ((1+#y)* i. #y) } ,((#y),(#y))$ ' '
>> )
>> f 'abcdef'
>> a
>> b
>> c
>> d
>> e
>> f
>>
>>
>> 2008/10/12 Ken Chakahwata <[EMAIL PROTECTED]>
>>
>>
>>
>>> I am looking at the various expressions contributed to date to see which
>>> ones are general enough to handle a character vector right argument.
>>>
>>> enjoy
>>> ken
>>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED]
>>> [mailto:[EMAIL PROTECTED] On Behalf Of Raul Miller
>>> Sent: 12 October 2008 18:35
>>> To: Programming forum
>>> Subject: Re: [Jprogramming] diagonal arrays
>>>
>>> On Sun, Oct 12, 2008 at 11:15 AM, Dan Bron <[EMAIL PROTECTED]> wrote:
>>>
>>>
>>>> (*=@/:)2 7 9 2
>>>>
>>>>
>>> Nice.
>>>
>>> I had been bothered by my earlier expression (* [EMAIL PROTECTED]@#) -- the
>>> [EMAIL PROTECTED] was
>>> only
>>> needed to ensure that values in each position were unique, and /: does
>>>
> that
>
>>> nicely.
>>>
>>> Thanks,
>>>
>>> --
>>> Raul
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>>>
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>>>
>>>
>>
>>
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