[R] modifying factors in a data frame

[Abhishek Pratap]

Kiaora Koe Peter

It worked. I hope I am getting my Maori right.

-Abhi

On Thu, Aug 19, 2010 at 1:50 AM, Peter Alspach
<Peter.Alspach at plantandfood.co.nz> wrote:
>
> Tena koe Abhi
>
> The easiest way is probably
>
> data1$sample <- as.numeric(data1$sample)
>
> If you want it to remain as a factor then
>
> data1$sample <- as.factor(as.numeric(data1$sample))
>
> HTH ....
>
> Peter Alspach
>
> > -----Original Message-----
> > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> > project.org] On Behalf Of Abhishek Pratap
> > Sent: Thursday, 19 August 2010 5:41 p.m.
> > To: r-help at r-project.org
> > Subject: [R] modifying factors in a data frame
> >
> > Hi All
> >
> > I have a data frame in which on the columns is a factor with following
> > levels
> >
> > Levels: M006 M0114 M0379 M0432 M0823 M1012 M1096 M1107 SW393 SW708
> >
> > I want to change all the M006 to "1", M0114 to "2" and so on.  What I
> > am
> > trying is not working.
> >
> > data1$sample[data1$sample =='M006'] <- "1"
> > Warning message:
> > In `[<-.factor`(`*tmp*`, data1$sample == "M006", value = "1") :
> >   invalid factor level, NAs generated
> >
> >
> > Any slick way to do this ?
> >
> > Thanks!
> > -Abhi
> >
> >       [[alternative HTML version deleted]]
> >
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