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

From: milton ruser <milton.ruser_at_gmail.com>
Date: Tue, 24 Jun 2008 20:03:20 -0300

Hi Anh,

I know that it is not so elegant, but may work.

x<-runif(10)
y<-runif(10)*2
z<-runif(10)*3

df<-data.frame(cbind(x,y,z))
df

df$f<-NULL
for (i in 1:nrow(df))
 {
 df[i,"f"]<-max(c(df[i,"x"],df[i,"y"],df[i,"z"]))  }

 Of course, others that know better apply family will solve if with a line :-)

There are some functions for rowSums, rowMeans (see the help).

Kind regards,

miltinho

On 6/24/08, 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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