Add --min_as option to convolute

[scarlehoff]

Although maybe the way I'm doing it is a bit... convoluted (canned laughter)

[andreab1997]

In general, I was not aware that this feature could be needed. Is there a specific application for which we would need to select only orders beyond, for example, NLO?

[andreab1997]

Can you a comment also about min_as?

[scarlehoff]

Yes. If you want to create an fktable with only the NNLO contribution for instance. It is not usual (for instance when doing a theory you won't) but we (w/ @cschwan) are using it now to study the NNLO of DY as a function of q.

This is equivalent to doing in pineappl:

pineappl evolve ${grid} ${eko} ${fktable} NNPDF40_nnlo_pch_as_01180 --orders "a2as2"

in pineko it would become

pineko convolute ${grid} ${eko} ${fktable} 3 1 --min_as 3

[andreab1997]

Yes. If you want to create an fktable with only the NNLO contribution for instance. It is not usual (for instance when doing a theory you won't) but we (w/ @cschwan) are using it now to study the NNLO of DY as a function of q.

This is equivalent to doing in pineappl:

pineappl evolve ${grid} ${eko} ${fktable} NNPDF40_nnlo_pch_as_01180 --orders "a2as2"

in pineko it would become

pineko convolute ${grid} ${eko} ${fktable} 3 1 --min_as 3

Yes, I guess that in pineko this is surely not the main feature so it makes sense to implement it as an optional argument. It is fine for me to merge this as soon as the docstrings are updated.