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 BOUĖTTÉ <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? ______________________________________________ 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.
