Andras: No. Using the a = c(1,8,9) and b = 2:3 that ** I posted before**, you get the single unique value of 1.
Please stop guessing, think carefully about what you want to do, and **test** your code. -- Bert On Tue, Jun 18, 2013 at 7:41 AM, Andras Farkas <motyoc...@yahoo.com> wrote: > Bert, > > thanks... The values should not repeat themselves if the same a is closest to > all b, so probably aruns example extended with a unique command works best? > > unique(a[sapply(b,function(x) which.min(abs(x-a)))]) > > thanks, > > Andras > > --- On Tue, 6/18/13, Bert Gunter <gunter.ber...@gene.com> wrote: > >> From: Bert Gunter <gunter.ber...@gene.com> >> Subject: Re: [R] find closest value in a vector based on another vector >> values >> To: "Jorge I Velez" <jorgeivanve...@gmail.com> >> Cc: "Andras Farkas" <motyoc...@yahoo.com>, "R mailing list" >> <r-help@r-project.org> >> Date: Tuesday, June 18, 2013, 10:07 AM >> Jorge: No. >> >> > a <-c(1,5,8,15,32,33.5,69) >> > b <-c(8.5,33) >> > a[findInterval(b, a)] >> [1] 8 32 ##should be >> 8 33.5 >> >> I believe it has to be done explicitly by finding all the >> differences >> and choosing those n with minimum values, depending on what >> n you >> want. >> >> Note that the problem is incompletely specified. What if the >> same >> value of a is closest to several values of b? -- do you want >> all the >> values you choose to be different or not, in which case they >> may not >> be minimum? >> >> a <- c(1, 8, 9) >> b <- c(2,3) >> >> Then what are the 2 closest values of a to b? >> >> -- Bert >> >> On Tue, Jun 18, 2013 at 5:43 AM, Jorge I Velez <jorgeivanve...@gmail.com> >> wrote: >> > Dear Andras, >> > >> > Try >> > >> >> a[findInterval(b, a)] >> > [1] 8 32 >> > >> > HTH, >> > Jorge.- >> > >> > >> > On Tue, Jun 18, 2013 at 10:34 PM, Andras Farkas <motyoc...@yahoo.com> >> wrote: >> > >> >> Dear All, >> >> >> >> would you please provide your thoughts on the >> following: >> >> let us say I have: >> >> >> >> a <-c(1,5,8,15,32,69) >> >> b <-c(8.5,33) >> >> >> >> and I would like to extract from "a" the two values >> that are closest to >> >> the values in "b", where the length of this vectors >> may change but b will >> >> allways be shorter than "a". So at the end based on >> this example I should >> >> have the result "f" as >> >> >> >> f <-c(8,32) >> >> >> >> appreciate the help, >> >> >> >> Andras >> >> >> >> ______________________________________________ >> >> R-help@r-project.org >> 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. >> >> >> > >> > [[alternative >> HTML version deleted]] >> > >> > ______________________________________________ >> > R-help@r-project.org >> 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 >> -- 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 ______________________________________________ R-help@r-project.org 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.
