Numbers, too!
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of David Ward
Lambert
Sent: Monday, December 10, 2012 9:32 AM
To: programming
Subject: Re: [Jprogramming] Just for fun, verb cross
cross
That is lovely Arie,
It is that kind of elegance that I was chasing with my rougher attempts.
Using the (+.|.) hook simplifies (|.+.]) precisely and the { 0 1 combined
with ' ',. means that the selection of the string becomes a choice in each row
of displaying either the corresponding
The expression fails if the argument has duplicate items. e.g.
((+.|.)@={0 1 ' ',.)'aabbb'
|length error
| ((+.|.)@={0 1' ',.)'aabbb'
On Mon, Dec 10, 2012 at 10:18 AM, bob therriault bobtherria...@mac.comwrote:
That is lovely Arie,
It is that kind of elegance that I was chasing
Here's a version that works with duplicated values (except note that
there was no specification for what the behavior should be in this
case):
(,@(#~01) (+.|.)@=)'abcde'
a e
b d
c
b d
a e
(,@(#~01) (+.|.)@=)'abcdedcba'
a e a
b d d b
c c
b d d b
a e a
--
Raul
On
Thanks for destroying my day.
Here's a much longer alternative
' ' (,{~[:((+.|.)@= ({0 1) 0,.) 1+i.@#@]) 'baabb'
b b
a a
a
b b
b b
_ (,{~ [: ((+.|.)@=({0 1) 0,.) 1+i.@#@]) 1 2 1 2
1 _ _ 1
_ 2 2 _
_ 1 1 _
2 _ _ 2
On 10-12-12 19:21, Roger Hui wrote:
The expression fails if the
Thanks Roger,
I guess this is why we race Ferrari's and go shopping in minivans. :)
My first draft survives repeats, but I still find Arie's version beautiful (and
functional within the specs of not having repeated items).
t0=:((.|.1)@(*=)@::@i.@#){ ' ',]
t0 'abcde'
a a
b b
c
d
Ugly as hell (but my J doesn't get any better without practicing):
cross =.(((1 {. 0 # ]), ]) {~ (:*(|.+.])@(=/~))@i.@#)
NB. Works for strings with replicated entries
cross 'aabbcdeabcde'
aa
b b
cc
d d
ee
aa
b b
cc
And, for what it's worth, here's a different plausible implementation
of cross (different only for the case of duplicated letters in the
argument when compared with the version I posted, below):
(,@(#~01) (+.|.)@=@(#\)) 'abcdedcba'
Note that replacing = with =@(#\) should also work for Aai's
My solution works by preparing a left argument for From { . It has rank two
solutions and is limited to string arguments.
cross
([: (+. |.1) [: (= * :) [: i. #) { ' ' , ]
cross 'a'
a a
a a
a
a a
a a
Kip Murray
Sent from my iPad
On Dec 10, 2012, at 1:48 PM, Raul
Without looking studying the sentence evaluator, I expected
+.|.@
(+. |.)@
to be identical to
+.(|.@)
|.@+.
Date: Mon, 10 Dec 2012 15:41:52 -0500
From: Raul Miller rauldmil...@gmail.com
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Just for fun, verb cross
Message-ID
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Just for fun, verb cross
Message-ID:
CAD2jOU8iKSKDjgPuPf26_wqUSd3QOgscqLcXkCtMC0xZj2o
+o...@mail.gmail.com
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For what it's worth, here's a parenthesis free implementation of my
two
First draft looks like this.
(((.|.1)@(*=)@::@i.@#){ ' ',])'abcde'
a a
b b
c
d d
e e
(((.|.1)@(*=)@::@i.@#){ ' ',])'ab'
aa
bb
One of the things that I like about J is the way it lets you build and test
your ideas as you go. I look forward to more elegant solutions.
Cheers, bob
Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Marshall
Lochbaum
Sent: Sunday, December 09, 2012 11:07 PM
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Just for fun, verb cross
Here's a pretty good version
Second draft is a little cleaner since rank 1 reverse is not required as the
matrix is still boolean at this point.
t=: (:@i.@# * (|.+.])@:=){' ',]
t 'ab'
aa
bb
t 'abcde'
a a
b b
c
d d
e e
Cheers, bob
On 2012-12-09, at 8:01 PM, bob therriault wrote:
First draft looks like
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