With the other pages I could use APL symbols instead of ⌈ and
⌊, but there are no good alternatives to ⌉ and ⌋ (other
than the &#nnnn; or &#xnnnn; codes).
The tryapl.com page is not APL2 but Dyalog APL. In Dyalog APL ⍳vector is
similar to {i.&.>vector in J. (Note: in Dyalog APL and APL2 the enclose of
a simple scalar is the identity function, so the extension is compatible
with expressions like ⍳⍴x). It is a useful result for indexing and indexed
assignment.
Dyalog APL did not used to display arrays with the boxes when appropriate.
I have had a part in talking them (us!) into doing it.
On Tue, Jul 2, 2013 at 3:19 PM, Joey K Tuttle <[email protected]> wrote:
> Touché ... but it is why I smile when I see the oft repeated assertion
> that Unicode solves the problem of conveying APL (and other) symbols...
>
> Other papers in
> http://www.jsoftware.com/**papers/<http://www.jsoftware.com/papers/>(e.g.
> Rational APL, Dictionary of APL, etc.) display correctly in all my
> browsers, but I'm guessing you don't use ⌊ and ⌈ there...
>
> Off the topic, but chat anyway - one of the pages that was up and looking
> reasonable in the same Chrome instance was
>
> http://tryapl.com/#
>
> APL characters there seem to look reasonably OK (not perfect, but
> recognizable). It seems like a nice little sandbox and I was poking at it
> realizing that I felt like a Stranger in a Strange land when doing so...
> That was an interesting feeling. I thought that maybe it was just the APL2
> direction that had me off balance, but I looked at IBM APL2 reference
> manual and saw nothing to explain/define the results of -
>
> ⍳2 3 4
> ┌→────┬─────┬─────┬─────┐
> ⍒1 1 1│1 1 2│1 1 3│1 1 4│
> ├~───→┼~───→┼~───→┼~───→┤
> │1 2 1│1 2 2│1 2 3│1 2 4│
> ├~───→┼~───→┼~───→┼~───→┤
> │1 3 1│1 3 2│1 3 3│1 3 4│
> ├~───→┼~───→┼~───→┼~───→┤
> │2 1 1│2 1 2│2 1 3│2 1 4│
> ├~───→┼~───→┼~───→┼~───→┤
> │2 2 1│2 2 2│2 2 3│2 2 4│
> ├~───→┼~───→┼~───→┼~───→┤
> │2 3 1│2 3 2│2 3 3│2 3 4│
> └~───→┴~───→┴~───→┴~───→┘
>
> I couldn't guess or figure out anything I might use it for - there are
> undoubtedly many other similar examples for someone using J for 25 years
> and not much APL in that same period. Anyone have a nice explanation for
> the difference from i.2 3 4 ?
>
>
>
> On 2013/07/02 14:28 , Roger Hui wrote:
>
>> Symbols: Hey, that's not my department. :-) In the HTML source they were
>> entered as ⌈ ⌉ ⌊ and ⌋, and the way that are
>> rendered probably depends on what fonts are installed on your system.
>> I've
>> looked at them in my Chrome browser in Windows and on my Galaxy Tab and
>> they look fine.
>>
>>
>> On Tue, Jul 2, 2013 at 2:17 PM, Joey K Tuttle <[email protected]> wrote:
>>
>> I don't have access to the 1968 edition, but would like to add that while
>>> the link to APLQA.htm#Knuth renders OK in Firefox, the symbols are messed
>>> up in Safari and Chrome on my iMac, but OK in both those browsers on my
>>> iPad... Dunno why, just saying.
>>>
>>> On 2013/07/02 13:39 , Eric Iverson wrote:
>>>
>>> The quote (below as taken from your link) appears in the 1968 edition.
>>>>
>>>> The notation [x] is often used elsewhere for one or the other of these
>>>> functions, usually the former; the notation above, which are due to
>>>> K.E. Iverson, are more useful, because both functions occur about
>>>> equally often in practice. The function ⌊x⌋ is sometimes called the
>>>> entier function, from the French word for “integer”.
>>>>
>>>> There is a small difference. The 1968 edition has: "...the notations
>>>> above...". (note the s).
>>>>
>>>> On Tue, Jul 2, 2013 at 4:26 PM, Roger Hui <[email protected]>
>>>> wrote:
>>>>
>>>>
>>>> http://www.jsoftware.com/****papers/APLQA.htm#Knuth<http://www.jsoftware.com/**papers/APLQA.htm#Knuth>
>>>>> <http://**www.jsoftware.com/papers/**APLQA.htm#Knuth<http://www.jsoftware.com/papers/APLQA.htm#Knuth>
>>>>> >
>>>>>
>>>>> Does anyone have the original edition of Knuth's *The Art of Computer
>>>>> Programming*, Volume 1, published in 1968? If so, can you please tell
>>>>> me
>>>>> whether the above quotation occurs in that edition?
>>>>>
>>>>> ------------------------------****----------------------------**--**
>>>>
>>> ----------
>>> For information about J forums see http://www.jsoftware.com/****
>>> forums.htm <http://www.jsoftware.com/**forums.htm><http://www.**
>>> jsoftware.com/forums.htm <http://www.jsoftware.com/forums.htm>>
>>>
>> ------------------------------**------------------------------**
>> ----------
>> For information about J forums see
>> http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm>
>>
>> ------------------------------**------------------------------**
> ----------
> For information about J forums see
> http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
