Hi Pedro Dist objects are visualized in your console as a matrix, but their structure is not quite a matrix (see str(d) in my previous example). Why can't you just use which(d==1.1837)? (d being your original matrix)
Regards, Francisco Pedro Mardones wrote: > Thanks Francisco; > I'm trying to avoid the step of converting a dist object into a matrix > because I'm working with matrices of more than 5000 rows x 5000 > columns. I just was wondering if someone knew any trick to do that. > > On 5/11/07, Francisco J. Zagmutt <[EMAIL PROTECTED]> wrote: >> But the dist object is not structured with rows and columns. i.e. >> >> x=1:4 >> >> d=dist(x) >> 1 2 3 >> 2 1 >> 3 2 1 >> 4 3 2 1 >> >> str(d) >> Class 'dist' atomic [1:6] 1 2 3 1 2 1 >> ..- attr(*, "Size")= int 4 >> ..- attr(*, "Diag")= logi FALSE >> ..- attr(*, "Upper")= logi FALSE >> ..- attr(*, "method")= chr "euclidean" >> ..- attr(*, "call")= language dist(x = x) >> >> So, AFAIK if you want to get references for rows and columns you need to >> make it an object that indeed has rows and columns, i.e. a matrix. See >> ?which to obtain the reference you want in a matrix. >> >> Regards, >> >> Francisco >> >> >> Pedro Mardones wrote: >>> Dear R users; >>> >>> Is it possible to get the row and column number of a particular entry >>> in a dist object? >>> >>> Let's say that I want to find the position of the value 1.1837 (the >>> last entry on the dist object below), that is [6,3]. Can I get those >>> values without transforming the object to a matrix?, i.e. working with >>> the dist object only. >>> >>> 1 2 3 >>> 2 0.23935864 >>> 3 0.56655914 0.71923104 >>> 4 0.15272561 0.37926989 0.43931332 >>> 5 0.17728654 0.13355685 0.73025495 >>> 6 0.61783536 0.52055379 1.18374889 >>> >>> Thanks for any idea >>> PM >>> >>> ______________________________________________ >>> [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. >>> >> ______________________________________________ >> [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. >> > > ______________________________________________ > [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. > ______________________________________________ [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.
