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Adám
Adám
06:53
@JosephAdams OK, incorporated. Thanks a bunch!
Any takers for such important operators as Scan, Inner product, and Outer product?
Arpit Saxena
Arpit Saxena
07:49
I'm not sure if this is the appropriate place to ask, but I get "VALUE ERROR: Undefined name: ⎕SE.UCMD" whenever I type a ] command in Dyalog. What can I do about it?
RikedyP
RikedyP
@ArpitSaxena Sounds like you don't have a session file loaded - let me see how you get that back
Adám
Adám
@ArpitSaxena How did you start Dyalog?
RikedyP
RikedyP
Also how did you obtain Dyalog and how do you start it and what platform are you on?
Adám
Adám
:-)
RikedyP
RikedyP
Okay @Adam is here lol
Arpit Saxena
Arpit Saxena
07:52
I installed this aur.archlinux.org/packages/dyalog-bin
Adám
Adám
Independent of everything, )load buildse and then executing BUILD_SESSION 'UK' should fix the problem.
Arpit Saxena
Arpit Saxena
Yeah that worked. Thank you :D
Also is there a way to make an array of functions? f f f just makes a train (not really familiar just read the aplwiki page on tacit programming)
Adám
Adám
@ArpitSaxena Kind of: aplcart.info?q=array of functions
Arpit Saxena
Arpit Saxena
@Adám Oo thanks. That's a nice website
 
1 hour later…
rak1507
rak1507
09:05
@Adám any updates on this?
Adám
Adám
@rak1507 Yes. The devs at Kattis are too busy, but they are attempting to hire a contractor to do the work, so it should be happening.
rak1507
rak1507
oh cool
do you know how they're planning on getting around the lack of scripting support? multiline dfns/large inputs?
Adám
Adám
@rak1507 Simples: 18.1
rak1507
rak1507
so it'll only be once 18.1 is out or are they getting early access
RGS
RGS
@Adám why are you writing Portuguese now?
Adám
Adám
09:08
@rak1507 Early (as in already so) access.
@RGS Por que não?
rak1507
rak1507
has it been tested if ⎕ and ⍞ both work with large inputs? I assume it would, but TIO doesn't so it might not do I guess
Adám
Adám
@rak1507 Good question. I'll forward that.
RGS
RGS
:D
Working for Dyalog, I write/speak/listen to English most of the day, not Pt. The other day, I went out for dinner and as I was ordering, I had to reference the menu because I had forgotten the name of the thing I wanted.
Adám
Adám
@JeffZeitlin We'll be publishing some details of this very soon.
RGS
RGS
As I was reading the name of the dish, the menu had an English expression there, so I read it, and just completed the order in English
Without realising the switch I had made :P
I'm being brainwashed.
Adám
Adám
09:13
@synthmeat Hey, welcome back. It has been a while!
rak1507
rak1507
wow 954 days
Adám
Adám
@rak1507 For things like echo input | hello.apl and cat input.txt | hello.apl there'll be no limit.
Only interactive input will retain the limit.
rak1507
rak1507
great, was thinking if it just pipes the apl to the interpreter somehow it might get a limit error like TIO does
@Adám why is there a difference?
Adám
Adám
@rak1507 TIO's "script support" is a total hack. Not the real deal.
rak1507
rak1507
Is the real deal having a limit on interactive input?
Adám
Adám
09:22
@rak1507 Not sure. I think it has something to do with having to reserve an input buffer. Should I ask for the technical details, or for John to come here?
@rak1507 No, I mean that it isn't really using script support (as it didn't exist in 17.1).
rak1507
rak1507
@Adám fair enough
xpqz
xpqz
09:53
This was quite interesting, and mentions APL and friends: canonical.org/~kragen/memory-models
 
1 hour later…
LdBeth
LdBeth
11:12
funny enough, I think I find the similar "replace one function to a different one still passed all tests" situation in the dyalogcompetation problem
that probably means there's a theorem I can use to simplify my current answer
Joseph Adams
Joseph Adams
11:53
@LdBeth note that I've found that the test cases aren't actually exhaustive for the set tasks...as in I've submitted solutions that were obviously not up to spec but still passed all tests
I suppose they're just guidance to reassure you that you're a least in the right ballpark
LdBeth
LdBeth
12:20
@JosephAdams I'm now almost sure that it's the same problem we're taking about ;)
yeah, I find a solution that I can construct a counter example passed all the test
RGS
RGS
13:11
It is actually easy to write solutions to the problems that pass the few test cases in there, but that aren't actually correct.
So it is advisable that you spend some time figuring out hard test cases/edge cases and then throwing them at your solutions.
rak1507
rak1507
damn so you mean my submission {⍵≡testcase1: answer1 ⋄ ⍵≡testcase2: answer2 ...} won't get full marks? :(
Adám
Adám
@rak1507 That should fail anyway, as the system has randomised tests.
rak1507
rak1507
not for phase 2
Adám
Adám
Phase 2 doesn't run any automated tests.
rak1507
rak1507
I know
Adám
Adám
13:27
Lots of array programming goodness in the previews for the upcoming ARRAY 2021 conference.
rak1507
rak1507
the neural network one mentions APL but says it wasn't performant enough, shame
RGS
RGS
14:14
@rak1507 I'd give it half the marks
rak1507
rak1507
I suppose now you're an employee you might be marking them!
RGS
RGS
@rak1507 If I'm marking like this, probably I won't be let anywhere near the solutions :P
Adám
Adám
14:35
Announcement: Webinar on error trapping techniques in 25 mins.
 
1 hour later…
rak1507
rak1507
15:52
tryapl on HN news.ycombinator.com/item?id=27460887
3
user
user
16:46
in The Nineteenth Byte, 7 mins ago, by DJMcMayhem
@cairdcoinheringaahing What do you call a group of APL superheros? The Dyaleague
 
5 hours later…
Feeds
Feeds
21:25
0
Q: In APL how to turn a string into a one cell vector

Simão LealSo, I have a function f that takes a string as input. I want to create a function g that maps f to a vector of strings. I.e. g 'Hello' 'world' should yield (f 'Hello')(f 'world') Here's what I did: g ← {f¨⍵} And this works just fine for the example above. However, it doesn't work when the right...

apl
Adám
Adám
@Feeds Yet another need for the Depth operator: f⍥1 Try it online!
rak1507
rak1507
nice
⊆ is fine though
Adám
Adám
@rak1507 Nope, see my second comment.
rak1507
rak1507
oh, good point, doable with ⊆⍣¯1 though (which is a fun inverse I just found out about)
it's really f¨ under ⊆
Adám
Adám
@rak1507 Won't work if f changes the structure.
@rak1507 Yes, but again an ad-hoc solution. ⍥1 is the generalised form.
rak1507
rak1507
21:37
it'd be nice to know what their specific f function was because otherwise finding a 'proper' solution seems pretty hard
is depth planned or is it a far future concept?
oh well looks like ⊆ was what they needed after all
Adám
Adám
@rak1507 I hope it is in the fairly near-future pipeline. I think I've convinced the necessary people. J has it, after all, and the symbol to be used is obvious.
rak1507
rak1507
why is ⍥ obvious?
Adám
Adám
Because it is very analogous to ⍤k and f⍤g is already related to f⍥g, so…
rak1507
rak1507
depth being similar to rank and the symbols already being used for related things doesn't necessarily make it obvious ⍥ is the right symbol for depth to me, but it makes sense a bit
Adám
Adám
@rak1507 {1=≡⍵:f⍵⋄∇¨⍵} or {⍵⍵≥|≡⍵:⍺⍺⍵⋄∇¨⍵} for a general Depth operator (limited to monadic application and positive ⍵⍵).
 
2 hours later…
Adám
Adám
23:39
Huh, I just noticed that John Scholes mused that k¨ could mean k⍨¨.
rak1507
rak1507
seems a bit strange but slightly reasonable
Wezl
Wezl
@Adám just spent half a minute trying to find that because of the ambiguity of ⍨ :/
Adám
Adám
@rak1507 My original proposal was for all of ⍨ and ¨ and ⍤k and ⍥k to do that.
rak1507
rak1507
it doesn't seem like a bad idea but it also doesn't seem particularly useful either, so I'm on the fence
Adám
Adám
… Just like @ does.
BQN does it in general too: Any array operand acts like the corresponding constant function, and any function operand is applied to the argument(s) to calculate the corresponding array operand.
rak1507
rak1507
23:46
I quite like k's thing of having arrays basically act like indexing functions
Adám
Adám
@rak1507 Quite useful for @ and thus for ⍢ (e.g. 'x'⍢⊃ is like 'x'@⎕IO or 'x'@(⍴↑1⍨)) and if done for ⍢ then it should apply to ⍥ too, and if to ⍥ then to ⍤ and if ⍤ then ¨. QED.
rak1507
rak1507
fair enough

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