Thanks for your work below.  How about a verb NP such that NP au is the 
appropriate left argument for p. ?  At your option it could be a dyadic verb 
with a NP u the appropriate left argument for p.  Either would serve my needs 
admirably.  ( a and u are rows 0 and 1 of au )

Raul Miller wrote:

> I think you are asking for this:
> 
> Np=:adverb define
>    'coef valu'=:m
>    [:+/ coef * (>:/~i.#valu) */@:^~"1 (1:,-&(}:valu))
> )
> 
> au=: 0 1 4 1,:0 1 3 6
> 
>   au Np"0 i. 5
> 0 1 8 27 64
> 
> That said, I think I would prefer to transform the
> argument so I could use p. in my derived verb.
> 
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