Right, one can even get away with,
13 : '((y i. M) , M) [ M=. <./ y'
] (i. , ]) <./
One reason I like tacit sentences is that, after some practice, one can
manipulate them easily. So, the following are equivalent,
{.@:I.@:(= >./), >./ NB. Jon's verb
] ({.@:I.@:([ = ]), ]) >./
] ({.@:I.@: = , ]) >./
] (i. , ]) >./) NB. The product of 13 : '((y i. M) , M) [
M=. <./ y'
(i. , ]) >./ NB. Raul's solution
On Wed, Jan 25, 2017 at 9:30 AM, Linda A Alvord <[email protected]>
wrote:
> Jon, I haven't been using J for a while so I tried your problem. In a way
> I must think like a beginner again. Here's my take after a false start
> where I used APL!
>
> [A=:?6#50
> 40 5 19 46 34 40
> >/A
> 1
> >./A
> 46
>
>
> i.$A
> 0 1 2 3 4 5
>
>
>
> A=>./A
> 0 0 0 1 0 0
>
> i.$A
> 0 1 2 3 4 5
> (A=>./A) #i.$A
> 3
>
> f=: 13 :'(y=>./y)#i.$y'
> f A
> 3
>
> f
> (] = >./) # [: i. $
>
>
> So this is "beginner Tacsit" that seems to work. Then it is fun to see
> what I can learn from the masters who have already solved your problem.
> Keep sending your questions. They are goo for all of us.
>
> Linda
>
>
>
> -----Original Message-----
> From: Programming [mailto:[email protected]] On
> Behalf Of 'Jon Hough' via Programming
> Sent: Tuesday, January 24, 2017 11:29 PM
> To: [email protected]
> Subject: Re: [Jprogramming] Return of max of list and it's index in single
> pass
>
> Yep, that's what I was looking for. Thanks!
>
> --------------------------------------------
> On Wed, 1/25/17, Raul Miller <[email protected]> wrote:
>
> Subject: Re: [Jprogramming] Return of max of list and it's index in
> single pass
> To: "Programming forum" <[email protected]>
> Date: Wednesday, January 25, 2017, 12:01 PM
>
> maxIndexAndValue=:
> ((i.,]) >./)
>
> I hope this
> helps,
>
> --
> Raul
>
>
> On Tue, Jan 24, 2017 at 9:58 PM, 'Jon
> Hough' via Programming
> <[email protected]>
> wrote:
> > I want to get the max value of a
> list, and return the first index of its occurrence in the list, tacitly.
> >
> > My
> solution
> >
> >
> maxWithIndex =: {.@:I.@:(= >./), >./
> >
> > works ok, but
> calculates >./ twice. Is there a tacit way to do this with only a single
> calc of >./ ?
> >
> > Thanks,
> > Jon
> >
> ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
