Re: [R] Find max of a row in data frame (like Excel)

From: Kenn Konstabel <lebatsnok_at_gmail.com>
Date: Thu, 26 Jun 2008 00:10:56 +0300

apply max to columns f1...f4 and assign it to rs$f:

rs$f <- apply(rs[,paste("f",1:4,sep="")],1,max)

or

rs$f <- apply(rs[,2:5],1,max)

On Wed, Jun 25, 2008 at 1:41 AM, Anh Tran <popophobia_at_gmail.com> wrote:

> Hi,
> Here's the data we have:
>
> > rs[1:5,]
> probe_id f1 f2 f3 f4 M A f
> 1 A_68_P20002076 2 58 0 0 1.51778114 6.344453 59
> 2 A_68_P20002775 22 8 15 0 0.43419304 5.488819 59
> 3 A_68_P20005791 43 3 0 0 0.05698666 9.830594 59
> 4 A_68_P20005805 11 34 0 0 1.71076835 6.624038 59
> 5 A_68_P20006729 16 44 0 0 0.85498261 6.044229 59
>
> I want rs$f be the max of f1, f2, f3, f4 like a function in excel (=max(f1,
> f2, f3, f4)).
>
> How should we do it in R? I'm not familiar with programing with list. So
> please be patient
> Thanks
> --
> Regards,
> Anh Tran
>
> [[alternative HTML version deleted]]
>
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