Thanks Jim,

That is exactly what I was looking for.

Marlene



2011/9/16 jim holtman <jholtman@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
> <marchenamarlene@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 <jcbouette@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 <marchenamarlene@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]]

