[Jprogramming] Index of item in table

['Skip Cave' via Programming]

What would a general "find the index of the value x in the array y" verb
named fixv look like?

It would work like this:

] p=.3 4 5$?60$50

10 49 11 0 4

39 33 34 32 38

49 24 43 36 41

1 21 11 14 27


7 28 38 9 26

24 42 39 12 3

8 28 33 1 4

46 40 7 49 0


10 8 49 37 39

5 45 46 39 6

7 38 32 2 7

5 10 48 16 37


45 fixv p

2 1 1


If there were more than one match, what should the output be?


Skip Cave
Cave Consulting LLC


On Tue, Dec 26, 2023 at 7:48 PM LdBeth <andpuke at foxmail.com> wrote:

> 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 :)
>
> >>>>> In <CAMw+KcroqQ4g=
> O4rKysTUQVjqQQTfxpqjy38ZwArNCD_TTLzgA at mail.gmail.com>
> >>>>>   David Pinchbeck <dpinchbe at gmail.com> wrote:
> > Having trouble finding this in the wiki:  I know that we can select from
> a
> > table using a boxed pair
>
> > A
>
> > 0 1 2 3 4
>
> > 5 6 7 8 9
>
> > 10 11 12 13 14
>
> > 15 16 17 18 19
>
> > 20 21 22 23 24
>
>
> > (<1 3){A
>
> > 8
>
> > How do I write a verb f to do the reverse, so that
> > 8 f A
> > yields the result 1 3  ?
>
> > Thanks,
> > David
> > --
> > David Pinchbeck
> > Associate Professor of Mathematics
> > St. Joseph's College
> > Standish, ME
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
>
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