> why do the sizes of the x and y argument to Key need to match?
Because the x u/. y key adverb is _defined_ so that
- items of x specify keys for _corresponding_ items of y and
- u is applied to each collection of y having identical keys.
You can argue that the definition should be something else, but it is not
debatable that if you are going to use u/. then items of x must have
corresponding items in y, that is, x and y must have the same number of
items, that is, {.$x must be the same as {.$y . x and y need not have the
same shape, but the leading element of their shapes must be the same.
On Sun, Oct 13, 2019 at 3:58 PM 'Jim Russell' via Programming <
[email protected]> wrote:
> Rick: My ability to read tacit expressions is so poor that I overlooked
> the fact that the your quoted output did not come directly from the Key
> expression; silly me, I thought there was some form of the
> modifiers/arguments to Key that yielded the results of two inputs.
>
> (In contrast to your skill, it took be about a half a day to come up with
> the tacit dyad(?) mmjnn=:(; ,.) to glue together my trigram table and one
> result vector.)
>
> So I wonder if I dare ask again:
> why do the sizes of the x and y argument to Key need to
> match?
>
> (Thanks again for all the help!)
>
> > On Oct 12, 2019, at 5:16 AM, Ric Sherlock <[email protected]> wrote:
> >
> >>> Or to summarise by trigram:
> >>>
> >>> (~.@; trig);|: <: #/.~&> supertrig
> >>>
> >>> +---+---+
> >>>
> >>> |ggt|1 2|
> >>>
> >>> |gta|2 0|
> >>>
> >>> |taa|1 1|
> >>>
> >>> |aaa|2 0|
>
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