now i have a question. last week i mentioned i was going to make a thermophysics project with an apl backend. i have created the backend in apl, no problem, but it seems stencil of any kind doesnt work in pynapl. im trying to port the apl code directly to python with pynapl.
so i wonder
1) if you have a way to define ({⍺↓⍵}⌺3 3) without the use of stencil or
2) if you know a way to use stencil in pynapl.

wait, it only works in eval, not in fn.

f = apl.fn("{⍵-⍨({m←2 2⌷⍵ ⋄ ⊃((-∘m+⌿)÷(-∘1≢)),⍺↓⍵}⌺3 3)⍵}")

print(f(apl.eval("3 3⍴⍳9")))

it gives a LENGTH ERROR

simpler example with LENGTH ERROR that doesnt use my actual function

f = apl.fn("{⊂⍺↓⍵}⌺3 3")

print(f(apl.eval("3 3⍴⍳9")))

this worked apparently
f = apl.fn("{⊂⍵}⌺3")
print(f(apl.eval("⍳9")))

i shouldve tested that. it seems this:
f = apl.fn("({⊂⍵}⌺3 3)")
print(f(apl.eval("3 3⍴⍳9")))
doesnt work

doesnt it? it works fine like this:
f = apl.fn("+⌿÷≢")
print(f(apl.eval("⍳6")))

f = apl.fn("{⍴⍵}")
print(f(apl.eval("3 3⍴⍳9")))

prints 3. something weird happens when the function is passed the evaluation

this works. something weird must happen when you pass a function an evaluated expression.
f = apl.fn("{({⊂⍵}⌺3 3)3 3⍴∊⍵}")
print(f(apl.eval("3 3⍴⍳9")))

hold up, this works
f = apl.fn("{⊂⍵}⌺3 3")
print(f(apl.eval("4 4⍴⍳9", raw=True)))
i have to use raw to tell it to not do python conversion weirdness