[R] how to make row.names based on column1 with duplicated values

[PIKAL Petr]

Hi

You probably meant
make.unique( gene, sep="-" )
[1] "a"   "b"   "c"   "d"   "c-1" "d-1" "c-2" "f"

I second your objection to such name tweeking.

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Jeff
> Newmiller
> Sent: Thursday, March 1, 2018 9:13 AM
> To: Stephen HonKit Wong <stephen66 at gmail.com>
> Cc: r-help at r-project.org
> Subject: Re: [R] how to make row.names based on column1 with duplicated
> values
>
> On Wed, 28 Feb 2018, Stephen HonKit Wong wrote:
>
> > Dear All,
> > Suppose I have a dataframe like this with many thousands rows all with
> > different names:
> > data.frame(gene=c("a","b","c","d","c","d","c","f"),value=c(20,300,48,5
> > 5,9,2,100,200)),
> >
> > I want to set column "gene" as row.names, but there are duplicates (c,
> > d), which I want to transform into this as row names: a, b, c-1, d-1,
> > c-2, d-2, c-3, f
>
> a) My reaction is that this doesn't actually sound like a very useful thing to do,
> so I caution you to beware of trying to accomplish too much with this
> capability... if it continues to be difficult to do what you want once you have
> these row names that appear nowhere else in your data, start looking for other
> ways to obtain the actual answers you want.
>
> b) If your data frame is stored in `dta`, then you can do
>
> rownames( dta ) <- make.names( dta$gene, unique = TRUE, sep="-" )
>
> ---------------------------------------------------------------------------
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