I'm planning to make a literate programming tool for J, and the
first step is to make a parser that can tokenlize J.
https://gist.github.com/LdBeth/8277950958b964d0778d70ffd3d998de
Almost everything except multi line explicit definitions are supported,
including multi line direct defin
an important reason was that Roger Hui wasn’t a big fan of the
>> proposed extension known as “structural under”
ldbeth
--
For information about J forums see http://www.jsoftware.com/forums.htm
I feel similar feature is covered by @ (At) from Dyalog APL,
as I can think of the definition for monadic "structural
under" using APL could roughly be
r←(f sunder g)y;i
i←,g⍳⍴y
r←(f@i)y
(⌽sunder,) 3 3⍴⍳9
9 8 7
6 5 4
3 2 1
ldbeth
>>>>> In
>>>&
The keyword you would need to looking for is "affine transformation"
https://en.wikipedia.org/wiki/Affine_transformation
Where image rotation is just a special case
[ cos(theta) -sin(theta) 0 ]
[ sin(theta) cos(theta) 0 ]
[ 00 1 ]
And you can combine with other linear tr
A very clever gimmick I saw from https://xpqz.github.io/AoC-day1/
is replace the following composite words:
'oneight' 'eightwo' 'nineight' 'twone' 'sevenine' 'eighthree'
by
'18' '82' '98' '21' '79' '83'
And it totally works XD
> In
> David Pinchbeck wrote:
> I'm trying to improve
While I know the most efficient way would be implement something like
an interval set, I'm just too lazy so instead I trust J can be efficient
enough and I can write efficient enough J program to solve by brutal force.
It spent about 30 minute to get the result up to the fourth pair, that
is 2714
igher dimension cases, how to implement this in J?
LdBeth
--
For information about J forums see http://www.jsoftware.com/forums.htm
thank to
everyone who presented their answer.
LdBeth
>>>>> In
>>>>> "'Viktor Grigorov' via Programming" wrote:
Viktor> A fully tacit solution would encapsulate the predicate too,
Viktor> here parenthesized for emphasis:
Viktor>
n
^
Page 40, "5 Registered names for globals and functions"
avoid confiction among names is to
^
I'll continue to explore the program and may send more feedbacks.
LdBeth
>>>>> In <9cf51392-f6c2-4726-88d1-bb22f903d...@smccak
This is related to the question I asked several days ago,
http://jsoftware.com/pipermail/programming/2023-December/062994.html
My suggestion would be
8 (($@])#:[i.~,@]) A
1 3
Although you might want to an alternative behavior when there are
multiple matches.
LdBeth :)
>>
0 0 1 1 0 1 0 0 0
p /: p
JE has crashed, likely due to an internal bug. Please report the code which
caused the crash, as well as the following printout, to the J programming forum.
LdBeth
>>>>> In <9d48c6be-8497-4dfd-8b17-415a135c1...@students.mimuw.edu.pl>
>&g
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