Thank you, Raul, I will study with interest. At first glance the key seems to be making the part in single-quotes "tacit when m and n have been substituted for". Kip
Raul Miller wrote:
> And here's a yet another "slightly cleaner" version:
>
> interp4=: 2 : '({. (1+m) difftb n) +/ .* ((i.1+m)&(!/))'
> 3 interp4 data
> 0 1 6 6 +/ .* 0 1 2 3&(!/)
>
> FYI,
>
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