... and if it Duncan's suggestion won't do, maybe approaching it via clustering might be useful. But do note that, as stated, the problem is not well defined, because transitivity fails: consider
v <- c(1,2,3,4,5,10) with a tolerance of <=2. Then 1 is the same as 2 and 3, 2 and 3 are the same as 4, but 1 is not the same as 4, etc. Exactly what would you choose as the "unique" values with this tolerance in this situation? -- Bert On Thu, Sep 6, 2012 at 9:47 AM, Duncan Murdoch <[email protected]> wrote: > On 06/09/2012 6:48 AM, Michael Bach wrote: >> >> Dear R Users and Developers, >> >> I am trying to do the equivalent of >> >> v <- c(1,2,3,3,2,1,) >> vu <- unique(v) >> >> for a vector such as >> >> v2 <- c(1.02, 2.03, 1.00, 3.04, 3.06) >> vut <- ... >> >> As indicated in the subject, we need approximately unique values with a >> defined >> tolerance, i.e. for the v2 vector the resulting vut vector using a >> tolerance of >> .1 should return e.g. >> >> [1] 1.02 2.03 3.06 >> >> Also, mean/min values instead of max could be returned. >> >> My actual question: Is there a convenience function or other mechanism >> already >> implemented that could do something similar? > > > It might be enough to round your values before checking. For the example, > > dups <- duplicated( round(v2) ) > v2[!dups] > > (This gives 3.04 rather than 3.06; I don't know if you care.) > > Duncan Murdoch > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
