I am starting to get the hang of _tacit_ function specification for
monadic functions - quite easy and intuitive, really, once it 'clicks'.
However, I am still in the dark when it comes to dyads.
An example: J provides the ! verb, which I understand is called 'Out
Of'. So I can easily make an nCr verb, since it's just the same thing
with the arguments commuted,
nCr =: !~
How would I go about, then, making an nPr verb, where nPr is nCr * r!
I can do it in two steps, if I first bond n to nCr, eg, 14P3 ->
n14Cr =: 14&nCr
(! * n14cr) 3
can anyone suggest how I do it in a single step?
Thanks
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