[R] problems to report indexes when I have two min value
jim holtman
jholtman at gmail.com
Fri Sep 16 19:37:19 CEST 2011
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 at 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 at 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 at 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 at 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 at 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
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