Add possibility to specify LHAPDF strings with member ids

NNPDF / pineappl

PineAPPL is not an extension of APPLgrid

https://nnpdf.github.io/pineappl/

GNU General Public License v3.0

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Add possibility to specify LHAPDF strings with member ids #143

Closed cschwan closed 2 years ago

cschwan commented 2 years ago

When we call pineappl convolute <grid> <pdfset>, the pdfset field is allowed to be either:

an integer, denoting an LHAID, which is 331100 for NNPDF4.0 NNLO as=0.1180
or a string, which would be NNPDF40_nnlo_as_01180 for the case above.

Sometimes we'd like to convolute with very specific replicas, which is only possible using the LHAID to which the replica ID must be added. For instance, the first (uncertainty) replica would be 331101. LHAPDF offers another possibility, which we should also support: NNPDF40_nnlo_as_01180/1. This requires adding another method in the LHAPDF rust interface first though.

Zaharid commented 2 years ago

Note that not every useful grid has an LHAID. Specifically the internal results from the fit do not have that.

cschwan commented 2 years ago

That's a good point; so this is even more important than I thought!

cschwan commented 2 years ago

Implemented in commit 1104374ae1b6721b9353e50095428dce5559226b.

cschwan commented 2 years ago

@Radonirinaunimi you might be interested in that as well (or might have liked to have it a few days ago :wink: ...).

Radonirinaunimi commented 2 years ago

@Radonirinaunimi you might be interested in that as well (or might have liked to have it a few days ago 😉 ...).

Thanks a lot @cschwan for this. It works perfectly fine! I am sure I will need this often in the future.

cschwan commented 2 years ago

This is now documented in https://github.com/N3PDF/pineappl/blob/master/docs/cli-reference.md#pdfset-specifying-pdfs-or-pdf-sets.