I was under the impression that all optimisations at dyalog were supposed to preserve behaviour with floating point numbers

@Adám I meant that +\ could still use memoization even if the elements aren't simple. I do agree that iterating over simple scalars must be more efficient than non-simple ones.

      nested←1⍴¨1000/1
      cmpx '∊+/nested' '+/∊nested'
  ∊+/nested → 3.3E¯5 |   0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
* +/∊nested → 9.7E¯6 | -71% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
      cmpx '∊+\nested' '+\∊nested'
  ∊+\nested → 1.6E¯2 |    0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
  +\∊nested → 1.6E¯5 | -100%

This one is quite interesting:

      cmpx '(⊂''>^<v'')⍳¨s' '''>^<v''⍳s' ⊣ s←(?1000⍴4)⊃¨⊂'>^<v'
  (⊂'>^<v')⍳¨s → 1.5E¯4 |    0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
  '>^<v'⍳s     → 1.5E¯6 | -100%

I don't think it's very golfy though

Despite getting rid of 22 whole bytes while bug fixing

Edit 23 bytes golfed

dyalog apl 17.1 installation fails on ubuntu 19.10. installer complains package libtinfo5 not installed. any help would be appreciated.

@Sherlock9 you don't need that 1, and 1↓ if you just require that the input be a vector always

@dzaima I don't know, this test case still says that's broken tio.run/##SyzI0U2pTMzJT///v/pR31RP/…

@Sherlock9 if that's the wrong output, it's still just as wrong as your current answer

Meant this one, pardon me tio.run/##SyzI0U2pTMzJT///v/pR31RP/…

Or f 0 0

@Sherlock9 ah yep, that's indeed a problem

Let me know when you figure it out

I've been bug fixing all day

TIL x⌹x=x finds the mean of a list vector.org.uk/sixteen-apl-amuse-bouches

@KritixiLithos Ooh that's fascinating

@aierl i guess asking the obvious first would be a start - do you have libtinfo5 installed? (apt show libtinfo5)

ah, i see - libtinfo5 has been replaced with libtinfo6 in Ubuntu 19, probably making it not installed by default. it still should be installable manually though

@dzaima Thanks for the tip it worked by installing it manually. :)

hm, the 17.1 deb file does have libtinfo5 as a dependency, so it should've been installed automatically along with Dyalog