Or: na.exclude(unique(c(X)))
On Fri, Feb 26, 2010 at 10:50 AM, Todd DeWees <t.dew...@cpse.dundee.ac.uk> wrote: > I found that using > > Sort(unique(c(X)) also works to remove NA.... if you don't mind the unique > values being sorted.... > > Todd DeWees, PhD > Statistician > University of Dundee > Mackenzie Building > Kirsty Semple Way > Dundee DD2 4BF > Scotland UK > PH: 01382-420119 > > > -----Original Message----- > From: David Winsemius [mailto:dwinsem...@comcast.net] > Sent: 26 February 2010 1:49 PM > To: Henrique Dallazuanna > Cc: Todd DeWees; r-help@r-project.org > Subject: Re: [R] Unique Values of a Matrix > > > On Feb 26, 2010, at 8:17 AM, Henrique Dallazuanna wrote: > >> Try this: >> >> unique(c(X)) > > I did but it returned NA as did: unique(as.vector(X)). > > To get rid of the NA's I needed to do: > > X[!duplicated(as.vector(X)) & !is.na(X)] > > (Logical indexing and does need as.vector() , or c() , to "straighten > out" the index expression.) > > Not sure why applying the straightening to the second logical term is > not equivalent: > > X[!duplicated(X) & !is.na(as.vector(X))] > [1] 1 2 4 3 1 7 2 > > This also: > > unique(c(X))[!is.na(unique(c(X)))] > [1] 1 2 4 3 7 > >> >> On Fri, Feb 26, 2010 at 10:06 AM, Todd DeWees >> <t.dew...@cpse.dundee.ac.uk> wrote: >>> I have a 280,000 x 11 matrix with various values and many NA >>> values. What I would like to do is get a vector of every unique >>> value in the matrix. >>> >>> For example: >>> >>> X = [ 1 2 NA >>> 4 3 1 >>> 7 NA 2 ] >>> >>> Returns: >>> Unique_X = [ 1, 2, 3, 4, 7] >>> >>> Thanks, >>> Todd >>> >>> >>> [[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. >>> >> >> >> >> -- >> Henrique Dallazuanna >> Curitiba-Paraná-Brasil >> 25° 25' 40" S 49° 16' 22" O >> >> ______________________________________________ >> 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. > > David Winsemius, MD > Heritage Laboratories > West Hartford, CT > > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
