I'm aware of ,: for homogeneous lists =) The main reason I was searching for a
solution and
eventually found <"0&> was specifically to deal with non-homogeneous lists
(such as a string
and two lists of numbers), as well as to deal with arbitrary numbers of lists
easily. The
manual alternative I found and was seeking to optimize was something along the
lines of this
(potential forks aside):
(<"0 input) , (<"0 parens input) ,: (<"0 depthOf input)
The dictionary example you linked is quite interesting! The 'table' definition
in profile
implements something similar which I've used before. I'm guessing it's a more
recent addition
than that dictionary page?
*/~ table 1+i.5
┌───┬─────────────┐
│*/~│1 2 3 4 5│
├───┼─────────────┤
│1 │1 2 3 4 5│
│2 │2 4 6 8 10│
│3 │3 6 9 12 15│
│4 │4 8 12 16 20│
│5 │5 10 15 20 25│
└───┴─────────────┘
~ Katrina
On 10/15/21 3:32 AM, Elijah Stone wrote:
On Fri, 15 Oct 2021, Katrina Scialdone wrote:
<"0&> input ; (parens input) ; (depthOf input)
NB. you can remove redundancies here using a fork:
<"0&> (] ; parens ; depthOf) input
Its behavior is quite similar to ,[0.5] in Dyalog APL, which was the
inspiration for finding a J equivalent.
If your lists are homogenous, you can use ,: instead:
x=. i.5
y=. -x
z=. *:x
w=. -:x
x , y , z ,: w
0 1 2 3 4
0 _1 _2 _3 _4
0 1 4 9 16
0 0.5 1 1.5 2
(Whoever thought the axis operator was a good idea, I have no idea... :)
Is this a known technique, and is there a common name for this?
I don't know of a specific name for it, but using boxes to format tables
is definitely common.
The dictionary uses something similar to demonstrate the 'table' adverb
(https://www.jsoftware.com/help/dictionary/intro03.htm).
-E
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