[Jprogramming] Show cause hearing: maximum rank will be 63

[John Baker]

At first I thought this was a tardy April Fools joke. I seem to remember some APLs had a rank limit in the 60s but like many I’ve never used ranks beyond 10.

Sent from my iPhone

> On Apr 4, 2021, at 09:09, Roger Hui <rogerhui.canada at gmail.com> wrote:
> 
> So Henry, can you imagine yourself doing FFT on a sparse hypercube, sparse
> because many of the entries are 0?  For this application not having rank
> restricted to 63 or less would be nice.
> 
> 
> 
> 
> On Sun, Apr 4, 2021 at 8:04 AM Roger Hui <rogerhui.canada at gmail.com> wrote:
> 
>>> I haven't used rank beyond 6 that I can recall, if that.
>> 
>> FFT uses a high rank array, a hypercube with shape (>.2^.#x)$2 .  Of
>> course, a rank-64 hypercube would blow current computers out of the water.
>> 
>> https://code.jsoftware.com/wiki/Essays/FFT
>> 
>> 
>> 
>> On Sun, Apr 4, 2021 at 7:55 AM 'robert therriault' via Programming <
>> programming at jsoftware.com> wrote:
>> 
>>> I haven't used rank beyond 6 that I can recall, if that.
>>> 
>>> I suppose that I could get around the limit by boxing items of a higher
>>> rank to reduce them to lower rank and using one verb to manipulate the
>>> boxes and another to manipulate the dimensions within the box.
>>> 
>>> What is the performance advantage to setting a boundary?
>>> 
>>> 
>>>> On Apr 4, 2021, at 07:45, bill lam <bbill.lam at gmail.com> wrote:
>>>> 
>>>> What's special about 63? Why not 128, say.
>>>> 
>>>>> On Sun, Apr 4, 2021, 9:52 PM Henry Rich <henryhrich at gmail.com> wrote:
>>>>> 
>>>>>> I propose that the maximum value for a rank, whether of a verb or a
>>>>>> noun, will be 63.  Minimum verb rank will be _63.
>>>>>> 
>>>>>> You got a problem with that?
>>>>>> 
>>>>>> Henry Rich
>>>>>> 
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