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RGS

9:42 AM

If I have a simple array with N dimensiosn

What do you call the operation of putting together the major cells, so that the dimension becomes N-1?

E.g. I have a 3D array and take its major cells and just build a taller matrix

Or I have a matrix, and instead build a longer vector out of the rows.

What do you call that operation, and how do you do it in general? :P

for matrices I'd do smth like ⊃,/↓mat

⊃⍪⌿⊂⍤¯1⊢ seems to work. Is it the best way?

1 hour later…

RikedyP

10:53 AM

@RGS Merge along leading axes: ,[⍳2]

Also covered in the webinar on Rank and Dyadic Transpose I think

sorry - "merge leading axes"

2 hours later…

RGS

1:04 PM

@RikedyP beautiful

Thanks for this

3 hours later…

RGS

4:34 PM

↑ @Adám prob new APLCart entry “melt merge fuse join along leading axis” ,[⍳2]

Tagging you 'cuz I can't PR right now and I'm afraid I'll forget

RGS

4:45 PM

@RikedyP I haven't watched those webinars yet D:

1 hour later…

Feeds

5:50 PM

Q: Dyalog SALT.Load exceptions "could not fix" for raw function trains

I've been experimenting with SALT but am encountering consistent Load problems that seem to only affect raw function-trains. I hoped for any advice on ensuring all functions Load correctly. To illustrate, in a clear workspace I'll create some example functions for converting hex and octal. Some...

Sherlock9

6:01 PM

Crossposting my question from the Discord server: How does this algorithm work? I'm having trouble parsing the train codegolf.stackexchange.com/a/158379/80214 The code: {0∊≢¨⍵:≢∊⍵⋄⌊/(≢.↑+∘∇↓¨)∘⍵¨1↓,⍳2 2} and the train: (≢.↑+∘∇↓¨)

rak1507

{0∊≢¨⍵:≢∊⍵⋄⌊/(≢.↑+∘∇↓¨)∘⍵¨1↓,⍳2 2}
 0∊≢¨⍵:≢∊⍵                             ⍝ if any of the lengths are 0 return the sum of the lengths (length of longest)
                          1↓,⍳2 2      ⍝ (0 1)(1 0)(1 1)
                       ∘⍵¨             ⍝ do the next stuff for each thing in ⍵, ⍵='turing' 'tarpit' for this example
                     ↓¨                ⍝ ('turing' 'arpit') ('uring' 'tarpit') ('uring' 'arpit')
                ↑                      ⍝ ('' 't') ('t' '') ('t' 't') (not quite but yes)