I find Nabble is better for searching the archive. It seems to be optimised for discussion list search. Link on homepage, 'secondary' into search box, and e.g. thread " Select from second key but not first".
> Dear Matthew > > Thank you for trying to guide me. Unfortunately I was not able to really > comprehend what I was reading > > I entered the following into google search "site: > lists.r-forge.r-project.org/pipermail/datatable-help/ secondary" > > I got many hits and I could see a discussion but could not fathom how it > related to my question. > > > Would love some help from you or someone else. I want to be able to select > by a criterion in the second key and accept all possible values in the > first key. > Farrel Buchinsky > Google Voice Tel: (412) 567-7870 > > > > On Wed, Jan 18, 2012 at 22:40, Matthew Dowle <[email protected]> > wrote: > >> Hi. Try searching datatable-help for 'secondary'. >> >> > In setkey it is possible to have multiple columns be a key. There is >> > however an order to it. To select all the rows by a particular value >> in >> > the >> > first key is easy >> > DT[J("a value from the first key")] >> > >> > It is even quite easy to select by an AND criteria that incorporates >> the >> > second key >> > DT[J("a value from the first key","a value from the second key")] >> > >> > But what happens if one wanted to select by only one criteria being a >> a >> > value that must be present in the second key? I was hoping to get >> lucky >> by >> > just leaving it blank. But it did not see to work. >> > >> > DT[J(,"a value from the second key")] >> > >> > I would love to know what you do. >> > >> > >> > Farrel >> > _______________________________________________ >> > datatable-help mailing list >> > [email protected] >> > >> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help >> >> >> >> >> > _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
