The ISO spec doesn't address what the index-of function should do when the
left argument is not a scalar or a one-dimensional array.
GNU APL extends this, but I don't really understand in what way. How am I
to interpret the output from this?
* (2 2 ⍴ 104 105 106 107) ⍳ (3 4 ⍴ 100+⍳100)*
┏→━━
Just from staring at the result, it looks like the result of ⍺⍳⍵ has the
same shape as ⍵, and for each item of ⍵ it tells you either the coordinates
where it was found in ⍺, or ⍬ if it was not found. (Dunno what it does if ⍺
is a scalar, where ⍬ would be a valid coordinate.)
N.B. in Dyalog APL dya
Hi Elias,
which spec are you referring to?
Best Regards,
Jürgen
On 4/14/20 6:06 AM, Elias Mårtenson
wrote:
I was reading the spec on outer join to see if I could
finally fully understand how i
Hi Elias,
my best guess is that this is a missing RANK ERROR somewhere.
I will look into it.
Best Regards,
Jürgen
On 4/14/20 10:15 AM, Elias Mårtenson
wrote:
The ISO spec doesn't address what the
s/join/product/ ?
In APL's inner product (X a.b Y), each item of the result corresponds to a
row of X combined in some way with a column of Y. So the shape of the
result is (¯1↓⍴X),(1↓⍴Y).
In APL's outer product (X ∘.b Y), each item of the result corresponds to an
item of X combined in some way w
Thank you. That makes sense.
Jürgen, I was referring to the ISO spec. I noticed that J has somehow
generalised the join operation so that the / has to be explicit. That
surely makes it more flexible, but I'm not sure what you can do with it, to
I turned to the spec.
Regards,
Elias
On Tue, 14 Apr
Hi again,
just saw that this is documented in "info apl" section "3.17.2
Generalized dyadic ⍳".
Apparently your ⎕IO is 0 which makes it a bit
mysterious. Otherwise:
A←2 2 ⍴ 104
105 106 107
B←3 4 ⍴ 100
Hi APLers,
let's start with the second challenge:
2 making the grade
(https://www.dyalog.com/uploads/files/student_competition/2019_problems_phase1.pdf)
"Write a function that, given an array of integer testscores in the
inclusive range 0–100, returns anidentically-shaped array of the
correspond
On Tue, Apr 14, 2020 at 05:40:26PM +0200, Otto Diesenbacher-Reinmüller wrote:
2 making the grade
(...)
Any hint?
I think all those ranges are mostly a distraction, because it's nowhere
said you need to handle out-of-range arguments in any graceful way.
I would start with ⍵>table[;2] which is
