Given a square matrix y, I am trying to golf down my J solution which returns 1 for a valid index list and 0 otherwise. Negative and too hight are both illegal for the purposes of this verb: (i.#y) */@e.~ ]

@Jonah -:(#y)&|

@ngn Doesn't seem to work on TIO, am I doing something wrong?

@J.Sallé No, it is just the TIO wrapper that doesn't handle statements with no result.

Ah, I see

@J.Sallé Try it online!

I'll run it on my machine then and see if I can make a gif of the result

@Adám or we can do that and save me the hassle of making a gif eh hahahahahahaah

@J.Sallé or add ⋄0 at the end of the dfn

@J.Sallé For timed tasks, I've used a drop-in for ⎕← which prints the time.

@ngn the only thing I don't get is how is the function outputting 7 lines if it's only called for 6 arguments (¨1↓¨,\?6⍴2 creates a 6 element vector)

@Adám that'd be nice to have

@J.Sallé on the sixth iteration the guard condition is satisfied and the part after : gets evaluated - there's another ⎕← there

@ngn yeah I literally just figured this out. Took me a while to notice there was a guard there

@J.Sallé How is this?

@Adám perfect!

@Bubbler very nice, ty

Finished editing my answer. Thanks everyone who helped :D

@J.Sallé Your first TIO link appears broken.

@J.Sallé Works now.

@Adám fixed.

@J.Sallé Impressive explanation!

@Adám Thanks hahahah I try my best.

@J.Sallé yeah, sorry for ruining your first one :)

Hahahahah it's okay though, I had to learn what some of the function was doing so I'd have to re-explain it to myself anyways

Also I enjoy writing :p

@J.Sallé Hello, I'm a new guy at Dyalog making stuff for new users

@RichardPark oh, cool! Welcome to PPCG and the Orchard :D

@J.Sallé I don't know what has been discussed, but apparently you'd like to help turn tutorials into jupyter notebooks or something maybe?

@RichardPark Yeah, I talked to Adám about that a while ago. I think I'll be able to get to it in early December (my uni's semester ends on Dec 7th)

I am also working on a general tutorials github, and interactive tutorial workspaces

github.com/rikedyp/DyalogTutorials

@RichardPark right off the bat I can suggest a link to this chat's APL lessons. Not sure if it's something you'd be looking to add into that repository, but they're certainly very useful and informative.

Yep very much - to start with everything's getting thrown in and then we're gonna filter it into useful bits + references to original material for further explanations

Ah, I see. I'd be glad to help if you need it :)