The APL Orchard

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PyGamer0

04:00

@xpqz is that all of the phase 1 problems from 2013-2021? cool

att

04:49

ok I've finally started learning APL thanks to the competition

Managed to finish phase 1 but it still feels like a struggle

2 hours later…

xpqz

06:46

@att If you managed to finish phase 1 you’re off to a good start.

PyGamer0

07:19

@att wow you finished phase 1, ... i am still stuck lol

att

08:04

Is there a better way to do {⍺⍵}?

dzaima

08:33

@att ,⍥⊂ is one char shorter, but not really much better

6 hours later…

Razetime

14:08

codegolf.stackexchange.com/questions/245570/… time to bring out the life builtin?

4 hours later…

LdBeth

17:38

I thought it was not possible to write affine image transformation in APL. But now I did it.

 res←m affine img;x;y;g;m;idx;⎕IO
 ⍝ affine transformation
 ⎕IO←0
 (x y)←⍴img
 g←¯1↓⍉⌊m+.×⍤99 1⊢⍉(1 x y⍴⍳y)⍪(⍉y x 1⍴⍳x)⍪1
 m←,∧⌿(x y>⍤0 2⊢g)∧0<g
 res←x y⍴(0,,img)[m×1+,+⌿y 1×⍤0 2⊢g]

5 hours later…

LdBeth

22:15

 ⍝ An improved one
 affine←{
     ⍝ affine transformation
     ⎕IO←0 ⋄ (x y)←⍴⍵
     g←¯1↓⍉⌊⍺+.×⍤99 1⊢(y/⍳x),∘1⍤,⍥⍪(x×y)⍴⍳y
     m←∧⌿(x y>⍤0 1⊢g)∧0<g
     x y⍴(0,,⍵)[m×1++⌿y 1×⍤0 1⊢g]
 }