The interesting thing happening here is that $ returns a list, and an
expectation that ^:0 (,0 looks the same) results in y unchanged.
$^:(2 -: $) 2 3
2 3
$^:(2 -: {:@$) 2 3
2
a rank 0 function (=) applied to a rank 1 argument is going to result in a rank
1 array.
$ $ ^:(,1) 2 3
1 1
$ $^:(1) 2 3
1
$ ^:(,0) 2 3
1 2
$ ^:(,0) 2 3
2 3
Even if the list argument (v to ^:) has only the single element 0, y must have
a leading axis added, in order for possibly more list items in arg to add to
result you are supposed to want with list n arg to ^: . The behaviour is
useful. ^:(i.n) will return a list of all of the iteration results
On Sunday, December 5, 2021, 10:41:25 a.m. EST, Marshall Lochbaum
<[email protected]> wrote:
I believe this should be the expected result. Calling $ on a list gives
a one-element list, which gives the result of ^: gets a leading 1 in the
shape. The value of that list's one element is 1 for the first example
and 0 in the second, causing the difference in ranks.
Marshall
On Sun, Dec 05, 2021 at 09:00:33AM -0500, David Lambert wrote:
> JVERSION
> Engine: j903/j64avx2/linux
> Beta-v: commercial/2021-11-16T21:55:10
> Library: 9.03.05
> Platform: Linux 64
> Installer: J903 install
> InstallPath: /home/lambertdw/downloads/installs/j903
> Contact: www.jsoftware.com
>
>
> $ ,:^:(2=$) 2 3
> 1 1 2
>
> $ ,:^:(2=$) 2 3 8
> 1 3
>
> I recall we've seen this in earlier beta versions.
>
> Thanks, Dave.
>
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