« first day (1402 days earlier)      last day (98 days later) » 

12:31 PM
Is there a better way to get the first n powers of a matrix than {⍺≡≢⍵:⊃¨⍵ ⋄ ⍺∇⍵,+.×/2⍴¯1⌽⍵} ?
 
 
2 hours later…
2:06 PM
Announcement: Presentation videos from Dyalog '20 now available at dyalog.tv
2
@rak1507 ^
 
2:24 PM
Great news, thanks for the update @Adám :D
I overslept each morning and missed some sessions that I was looking forward to..
 
Great, now to watch em
 
@Marshall Am I correct in remembering this algorithm from your presentation on sub nanosecond searches?
 
2:49 PM
@ab5tract No, you're probably thinking of binary search. Dyalog doesn't use quickselect as of 18.0.
 
@Marshall Thanks for clarifying. I guess I remember being so impressed with the results you were able to achieve that I blocked the fact that it was "just" binary search!
 
@Adám oh great thanks :)
 
3:17 PM
cmc: implement ∩ in terms of ∪ and ~
 
@rak1507 umm, 3 bytes
 
Oh
 
:p
 
Are you sure?
 
@rak1507 passes ∧/{(?100⍴100) ((solution)≡∩) (?100⍴100)}¨⍳100000
got another 3-byter that's much cooler
 
3:24 PM
Didn't think you could do better than ∪~~⍨∪~
 
@rak1507 hint
 
??
Alright I give up
 
my solution. CMC: find the "much cooler" version
 
Oh you're using other functions
I meant entirely with ~ and ∪
 
@rak1507 well, you're using
 
3:29 PM
{(⍺∪⍵)~(⍺~⍵)∪(⍵~⍺)} works I guess
 
@rak1507 you can expand mine to a dfn with no extra chars too
 
fair point
 
3:48 PM
I just watched Roger's talk on inverted tables from Dyalog '18. That was interesting.
 

« first day (1402 days earlier)      last day (98 days later) »