Maybe being left handed makes it easy to build definitions from right to
left.
3}.}.'abc*ef'
ef
3{.'abc*ef'
abc
3{'abc*ef'
*
m2f=: 13 :'((x{y),x{.y),x}.}.y'
m2f
({ , {.) , [ }. [: }. ]
3 m2f 'abc*de'
*abcde
5 m2f 3 4 5 6 7 2 8 9
2 3 4 5 6 7 8 9
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Viktor Cerovski
Sent: Tuesday, January 31, 2012 11:49 AM
To: [email protected]
Subject: Re: [Jprogramming] Understanding C. , A.
David Ward Lambert wrote:
>
> Are there simple versions of swap and of move_to_front that use C. , A.
> or (other)? My definitions use amend. Thank you, Dave.
>
> 1 5 swap 'abcdefgh'
> afcdebgh
>
> 3 move_to_front 'abc*ef'
> *abcef
>
>
> swap=: ({~ |.)~`[`]}
> move_to_front=: ((({~ _1&|.)~`[`]})~ i.@:>:)~
>
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
>
move2front=: { , {. , }.@}.
3 move2front 'abc*ef'
*abcef
--
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