What fun!
When I saw this:
<'Qsc'
┌───┐
│Qsc│
└───┘
and visualized this:
a
┌─┬─┬─┬──┬─┬──┬─┬───┬───┐
│N│A│Q│GS│G│GM│S│Qsc│AUS│
└─┴─┴─┴──┴─┴──┴─┴───┴───┘
The answer just jumped off the page!
a=<'Qsc'
0 0 0 0 0 0 0 1 0
I enjoyed the time I spent with examples of E. and am sure it will come in
handy in the future. But thanks so much for the wakeup call. I have gotten
excited about J in the last few months and maybe you'll also find it fun to
scramble some of your ways of thinking about APL to match what is possible
using J .
Thanks again. I knew there was an easier way!
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Simon Barker
Sent: Thursday, March 29, 2012 10:26 AM
To: 'Programming forum'
Subject: Re: [Jprogramming] one element list of an integer to an atom
Hi Linda,
Despite having followed these forums for several years I still can't read J
very well, mainly because I don't actually use it that often, but if I
understand what you are trying to do, does this fit the bill:
a E.~ <'Qsc'
0 0 0 0 0 0 0 1 0
a E.~ <'N'
1 0 0 0 0 0 0 0 0
Simon
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Linda Alvord
Sent: 29 March 2012 15:01
To: 'Programming forum'
Subject: Re: [Jprogramming] one element list of an integer to an atom
Here's how I came upon the problem.
a=:'N';'A';'Q';'GS';'G';'GM';'S';'Qsc';'AUS'
f=: 13 :'>"0,L:0 y'
d=: 13 :'(''''$,}.$f y)=+/"1 ((}.$f y){.>x)="1 f y'
'Qsc' d a
0 0 0 0 0 0 0 1 0
'N' d a
1 0 0 0 0 0 0 0 0
a
--T-T-T--T-T--T-T---T---¬
¦N¦A¦Q¦GS¦G¦GM¦S¦Qsc¦AUS¦
L-+-+-+--+-+--+-+---+----
Surely, this can be improved upon.
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Linda Alvord
Sent: Thursday, March 29, 2012 9:24 AM
To: 'Programming forum'
Subject: Re: [Jprogramming] one element list of an integer to an atom
Here's a summary of all your good ideas:
]a=:1$3
3
]b=:1 1 1 1$3
3
(0{,b)=2 3 4 3 6
0 1 0 1 0
({.,b)=2 3 4 3 6
0 1 0 1 0
(,/b)=2 3 4 3 6
|length error
| (,/b) =2 3 4 3 6
(,/a)=2 3 4 3 6
0 1 0 1 0
]a=:1$3
3
]b=:1 1 1 1$3
3
(0{,b)=2 3 4 3 6
0 1 0 1 0
({.,b)=2 3 4 3 6
0 1 0 1 0
(,/b)=2 3 4 3 6
|length error
| (,/b) =2 3 4 3 6
(,/a)=2 3 4 3 6
0 1 0 1 0
''$,b
3
Thanks to everyone! All work for one element list. Some are more versatile than
that. I had remembered only $, from APL, but couldn't make it work because
it doesn't. I guess special code ''$,b is the way to go. Do you agree.
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Simon Barker
Sent: Thursday, March 29, 2012 6:47 AM
To: 'Programming forum'
Subject: Re: [Jprogramming] one element list of an integer to an atom
The old APL idiom was
'' {reshape} data
which translates as
'' $ , data
In J.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Linda Alvord
Sent: 29 March 2012 09:20
To: 'Programming forum'
Subject: [Jprogramming] one element list of an integer to an atom
a=:1$3
a
3
3= 2 3 5 3 4
0 1 0 1 0
a= 2 3 5 3 4
|length error
| a =2 3 5 3 4
".a
|domain error
| ".a
a+5
8
Clearly, a is numeric. How can I change a to a numeric atom 3 , rather than
a one element list 3 ?
I need to find where the 3's are in a list. The result of executing some
expression has produced a one item list of a 3 .
I think I may have known how in APL once upon a time.
Linda
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