Thanks Jim, That is exactly what I was looking for.
Marlene 2011/9/16 jim holtman <jholt...@gmail.com> > Will this work for you: > > > dat <- > + > matrix(c(5.4,4.8,5.6,4.8,NA,4.4,4.6,3.4,NA,NA,4,2.4,NA,NA,NA,2),byrow=TRUE,ncol=4) > > k <- apply(dat, 1, function(x) which(x == min(x, na.rm = TRUE))) > > k > [[1]] > [1] 2 4 > > [[2]] > [1] 4 > > [[3]] > [1] 4 > > [[4]] > [1] 4 > > > sapply(k, paste, collapse = ', ') > [1] "2, 4" "4" "4" "4" > > > > > On Fri, Sep 16, 2011 at 12:26 PM, marlene marchena > <marchenamarl...@gmail.com> wrote: > > Sorry, maybe I was not clear in what I want. I need the two indexes. > > > > k > > 2 4 > > 4 > > 4 > > 4 > > > > Marlene > > > > 2011/9/16 Jean-Christophe BOUÄTTÃ <jcboue...@gmail.com> > > > >> Hi there, > >> Assuming you would prefer to have only one min per row: > >> > >> apply(dat,1,which.min) > >> > >> there is a link to this function in the help page for ?min. > >> JC > >> > >> 2011/9/16 marlene marchena <marchenamarl...@gmail.com>: > >> > Hi, > >> > > >> > I need to repor the index of a min value of each row in a matrix, but > I > >> > don't know how to do that when I have more than one min value. > >> > > >> > Here is my example > >> > > >> >> dat <- > >> > > >> > matrix(c(5.4,4.8,5.6,4.8,NA,4.4,4.6,3.4,NA,NA,4,2.4,NA,NA,NA,2),byrow=TRUE,ncol=4) > >> > > >> >> dat > >> > [,1] [,2] [,3] [,4] > >> > [1,] 5.4 4.8 5.6 4.8 > >> > [2,] NA 4.4 4.6 3.4 > >> > [3,] NA NA 4.0 2.4 > >> > [4,] NA NA NA 2.0 > >> >> k <- apply(dat, 1, function(x) which(x == min(x, na.rm = TRUE))) > >> >> k > >> > [[1]] > >> > [1] 2 4 > >> > > >> > [[2]] > >> > [1] 4 > >> > > >> > [[3]] > >> > [1] 4 > >> > > >> > [[4]] > >> > [1] 4 > >> > > >> > But I need an output like this > >> > > >> > k<- 2 or 4, 4, 4, 4 > >> > > >> > Someone could help me with this issue. > >> > > >> > Thanks in advance, > >> > > >> > Marlene. > >> > > >> > [[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. > >> > > >> > > > > [[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. > > > > > > > > -- > Jim Holtman > Data Munger Guru > > What is the problem that you are trying to solve? > [[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.
