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$50 10 49 11 0 4 39 33 34 32 38 49 24 43 36 41 1 21 11 14 27 7 28 38 9 26 24 42 39 12 3 8 28 33 1 4 46 40 7 49 0 10 8 49 37 39 5 45 46 39 6 7 38 32 2 7 5 10 48 16 37 45 fixv p 2 1 1 If there were more than one match, what should the output be? Skip Cave Cave Consulting LLC On Tue, Dec 26, 2023 at 7:48 PM LdBeth <andp...@foxmail.com> wrote: > This is related to the question I asked several days ago, > > http://jsoftware.com/pipermail/programming/2023-December/062994.html > > My suggestion would be > > 8 (($@])#:[i.~,@]) A > 1 3 > > Although you might want to an alternative behavior when there are > multiple matches. > > LdBeth :) > > >>>>> In <CAMw+KcroqQ4g= > o4rkystuqvjqqqtfxpqjy38zwarncd_ttl...@mail.gmail.com> > >>>>> David Pinchbeck <dpinc...@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 > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
